this is "nightline." tonight -- the ultimate travel hacks from the guy who seemed to know them all. from first-class cabins to five star hotels. he says anybody can fly in style for less. now he is sharing his secrets. >> the sisters turned down a record setting $30 million on shark tank. >> no. >> because they think their secret formula is worth much more. in a sea of startups has coffee meets bagel found the key to finding romance. >> remembering bobbi kristina. in the spotlight since birth. ♪ my baby ♪ whitney houston's beloved only daughter gone at 22 years old. >> give me the perfect life for whitney houston?

>> sitting, looking at my daughter. >> tonight their time together and their family now grieving once again. >> but first, the "nightline" five. >> when you travel we help you make all kind of connections. connections you almost miss. and ones you never thought you would make. we help connect where you are to places you never thought you would go. this is why we travel. and why we continue to create new technology to connect you to the people and places that matter. >> number one in just 60 seconds. some of my competitors plan to reduce the use of antibiotics over the next few years. but what are you having for dinner tonight? try perdue® simply smart® and harvestland®. two trusted perdue brands of chicken raised with no antibiotics ever.

♪ ♪ ♪ ♪ good evening. thank you for joining us. if you haven't booked your

summer vacation yet, no worries. the guy you are about to meet says last minute travel can actually work to your advantage. and tonight he is sharing all of his hacks to help you get around the globe like he does. which is to say in some very serious style. here's abc's david wright. ♪ >> reporter: even if you are a jet setter even if you are an executive platinum diamond-plus global services frequent flier, chances are you never met anyone as devoted to the art as ben shlapin. >> i fly 400,000 miles a year. >> reporter: what's known as a travel hacker. a savant in the realm of travel loyalty programs. >> i eat, breathe travel. >> reporter: at age 25 he has probably thrown more miles than you will in a lifetime. >> i have flown 4 million miles. >> reporter: 4 million miles enough to go to the moon and back eight times. or around the world 160 times.

where have you been in the past week to ten days? >> reporter: in the past ten days i have been i don't even know. >> reporter: you don't know? >> i really don't. >> reporter: come on. >> i couldn't tell you starting monday. i wake up in the morning. look at the calendar. figure out what is happening. >> reporter: the industry may call him travel hacker. he doesn't like the term because hacking implies something nefarious. some one like justin ross lee made famous in the viral video from elite daily. >> i answer a lot of hate mail. you're a real [ bleep ]. >> reporter: ruthlessly enjoying every perk he can grab. >> i don't scam airlines. airlines scam consumers. they're a goliath. i'm david. >> reporter: ben doesn't break any rules. >> mine is to stay within the guidelines maximize my value but don't break rules. >> reporter: what he does xiz mroit -- is exploit the fine print. you heard of american association of retired persons.

>> have you heard of aarp term life. >> reporter: you are a member of aarp? >> i am. completely legitimate. there are no age requirements to join. you save $400 on british class tickets. >> reporter: he lived out of his carry-on suitcase since last april. >> do you ever miss the comforts of home? >> i do. something nice about having a fridge and something to come home to. >> reporter: it is not stocked with tiny little bottles. >> exactly. >> reporter: on the rare occasions he does make it home to visit his parents. he is still dreaming of far off adventures. >> this is benjamin's flight simulator. he loves playing with that when he has free time. >> reporter: he can afford to do this because he master the fine print of travel and credit card loyalty programs. deal them out. what have you got here? >> what do you want. just about everything. every cardish ourer airline, hotel. credit cards. >> reporter: every single one of them. remember, george clooney in that

movie "up in the air." >> how dare you bring that into this palace? >> reporter: ben is george clooney 2.0. >> which credit card do you use for every day spending? >> american express card. >> which american express? you want to do everyday preferred. this gives you triple points on supermarkets. american express will let you have four credit card. as many as you want. seven am can express card. >> one, two, three, four credit cards. >> reporter: why so many? >> business. >> there is benefits for each of these. this gets you triple points on airfare. spend a lot on airfare the good part. american express platinum into the centurian lounges. >> reporter: other card he uses to double or triple his points. one mile at a time. that's his blog. and his philosophy. this is more than just a hobby for you, right? this is a job? >> it is a job. it's an obsession.

i guess my life. >> reporter: you take it to a whole another level? >> i guess it is very different. for me getting there is half the fun. often more than half the fun. depend on the airline. go to the middle east a fair amount flying emirates there in first-class first-class. you get a shower on a plane. have you ever showered on a plane? a little jaded nowadays. i giggle every time i shower on a plane. >> reporter: ben is meeting up with two apprentice hobbyists people he inspired. carrie and stephen, two working professionals who used ben's advice to travel the world on the cheap. >> probably flown 2 million miles. the trip to charleston would have been about $2,000 to $2,500 for airfare and hotels. saving using miles and taxes and fees that are probably costing me $100 $200. >> probably spent about -- oh let's say $16,000, $20,000 on luxury vacations over seven years. it's not cheap. i am still putting out $20,000. maybe a little more.

but probably about $150,000 value. >> reporter: all that plastic gives them something more than just bragging rights. if you have all these credit card don't you have doesn't that lower your credit score? >> like on a scale of 850, the credit score last i checked was 837 in the top two percentile. i have over 40 credit cards open. >> reporter: airlines are constantly changing the rules making it difficult for people to earn miles for free trips. our guy has about 40 different credit cards and a credit score he says of 837. how is that possible? >> it's not the number of credit card that you have per se but how you are managing those credit card that ultimately deter menmines whether you are worthy or unworthy? >> what do you think of the guys? >> genius. fun, genius. i think it is time consuming. a lot of time on your hand. these are professionals. >> reporter: professionals or not. there are practical money saving tips for those of us a little

closer to earth. tich one tip one, use the right credit card. >> something you should really consider. the difference between earning one point per dollar and three points per dollar could be huge. >> reporter: tip two, no such thing as a free smile.mile. >> redeem them when you are getting good value out of them. >> reporter: tip three, book really early or really late. >> this is why i book so many tickets often the same day. >> reporter: last minute travel is okay? >> the best time to plan. >> jimmy: jet set status means airlines and hotels treat him better than most of us mere mortals. expedited tsa screening, access to high level lounges even run ins with fellow hobbyists are par for the course. >> ever been to cairo? >> reporter: even so like george clooney in the movie he looks forward to the day when he can unpack his carry-on for good. >> until i figure out where i actually want to be i will keep moving iful

hopefully not forever. getting a dog and a house. and never getting on a plane again? >> you crave that? >> i do. >> chicago for a day. then on to the next stop. in the meantime let's have some fun. >> reporter: he figures he might as well enjoy every mile. i'm david wright for "nightline" in new york. next we're looking for love on line. there is a secret to perfect pairing, does it lie in a computer algorithm? plus remembering bobbi kristina. the family of whitney houston's cherished daughter coming together tonight. what about my family? my li'l buddy? and what if this happened again? i was given warfarin in the hospital but i wondered if this was the right treatment for me. then my doctor told me about eliquis. eliquis treats dvt and pe blood clots and reduces the risk of them happening again. not only does eliquis treat dvt and pe blood clots but eliquis also had significantly less major bleeding than the standard treatment.

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you are about to meet young entrepreneurs who say the selections on their dating app are better than the rest. in fact they call it anti-tinder. what's the secret? tonight we put coffee meets bagel to the test. juju chang meets women looking for modern love. >> reporter: these three sisters are about to make the biggest financial decision of their lives. >> if i offered you $30 million for the company would you take it?

>> no. >> mark cuban making a record setting offer on abc's shark tank seeing huge potential in their dating app, coffee meets bagel. >> he offered you $30 million and you didn't even flinch. >> reporter: the sisters walked away from all of that cash more than six months ago. >> this baby is going to explode. >> reporter: when you said no to $30 million, did people think you were crazy? >> we got so many e-mails from people. are you crazy? you sisters are so crazy. what are you thinking? >> reporter: they think coffee meets bagel is worth a whole lot more. after all the popular dating app tinder is worth roughly $1.5 billion. the sisters market their service as an alternative for those fed up with the other apps which they said leads to aggressive oversexualized dates. their matches focusing on quality not quantity. >> we look to call ourselves the

anti-tinder. any woman who have used tinder probably has at least one or many stories of the kind of behavior that you see men exhibit on tinder. it's not the greatest experience. and it just doesn't feel it feels creepy. >> reporter: tinder told us women make up nearly half of tinder's user base. and that it is creating meaningful and lasting connections around the world. >> when you are first talking to someone. don't know if i should text them. >> reporter: 24-year-old jamie miller just moved to san francisco and has had plenty of online dating horror stories. >> dating in san francisco is a little hard. when you come here from a small town in ohio. and then you are moved off to a big city. >> reporter: she is putting coffee meets bagels match making recipe to the test. here's how it works. each day at noon a user is given one bagel, a potential match carefully generated by the company formula, a computer

algorithm, stalks your face book page interest experiences, combing through facebook friends to match you with friends of friends with similar profiles. users get 24 hours to swipe yes to a match, if you beth agree, the couple can privately chat to set up a date. >> tonight i am going on a date with a guy that i met on coffee meets bagel. >> exciting. >> i know. >> what's his name? >> zach. >> getting ready for my date. got to look pretty. >> reporter: coffee meets bagel, faces competition, apps the hinge, bumble and the league are all going after the $2 billion pie. >> there are so many online dating apps out there. why do we need another one? >> the vast majority are optimized for men. >> men want quantity. >> they really enjoy browsing photos of men. women that doesn't really work. because we don't lookike to waste time.

>> reporter: tonight jamie is hoping zach is mr. right. a 26-year-old doing business development for a startup. >> cheers. >> first up swanky cocktails. >> i ran cross-country in college and track. >> oh cool. i did cross-country in middle school. then i, a runner ever since. >> reporter: of course these two have tons in common not fate. a computer generated match. >> one of the really important factors is your social graph. who do you share in common with other matches? >> reporter: hopefully it will spark romance. >> things are going really good so far. we have had good conversation. we have a lot in common. >> reporter: as the sun sets over san francisco, jamie and her date head next door for dinner. >> i do like how what i appreciate is that everyone is so different. >> yeah. >> just nice. everyone is so nice. >> everyone is so nice. >> reporter: things seem to go okay. but was it love in the making? >> it was great.

i was excited to day. and going well. >> we had really good conversation the whole time. we actually found out even more than we had in common than than from just talking on the app. that was really cool. >> are you ready? >> yeah. >> whether or not this bagel turns out to be the everything bagel, the sisters are confident their app has the what it takes. they both more than 20,000 relationships. more than doubling its user base since shark tank. >> this is the shark, named mark. we've got him by his tail. >> take that mark cuban. >> exactly. >> take that and swim away. >> you were called greedy. you were called arrogant. you were called a lot of nasty names for turning down $30 million. >> yeah yeah it was rough. but you know at the end of the day we know we made the right decision. >> reporter: one could are gau there was a tinge of sexism to it? >> yeah have to wonder being called greedy golddigger, all these things would we have been

called those names if we were not women? >> i think if we were men we probably would have been called bold visionary for, and brave for rejecting the $30 million. but, but of course we weren't called that. >> reporter: but their brave, bold vision could in fact come true just as long as bagels like zach and jamie continue to meet haply for happily for coffee. for "nightline," juju chang in san francisco. >> bye. >> have you had any memorable match ups with a dating app. keep it clean. head to our "nightline" facebook page and tell us your stories. next remembering bobbi kristina brown. a life in the spotlight. hey terry stop they have a special! so, what did you guys think of the test drive? i love the jetta. but what about a deal? terry, stop! it's quite alright... ok, you know what? we want to make

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oh my gosh, it's the guy from last night. what?! can i jump on your wi-fi? yeah, you can try it. hey! i had a really good time last night. yeah, me too. the only thing is that... the only thing is what? what's the only thing? oh my gosh he's married. he's a kleptomaniac. he's a pyromaniac. he's a total maniac. hey! hey! go back to your wife you sociopath! leave slow internet behind. get the wi-fi you need for better streaming. the 100% fiber optic network, is here. tea? get out of the past. get fios. call the verizon center for customers with disabilities at 800.974.6006 tty/v iran keeps their nuclear facilities. military sites can go uninspected. restrictions end after 10 years. then iran could build a nuclear weapon in two months. iran has violated 20 international agreements

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well, sir. after some serious consideration i'd like to put in my 15-year notice. you're quitting!? technically retiring, sir. with a little help from my state farm agent i plan to retire in 15 years. wow! you're totally blindsiding me here. who's gonna manage your accounts? this is a devastating blow i was not prepared for. well, i'm gonna finish packing my things. 15 years will really sneak up on you. jennifer with do your exit interview and adam made you a cake. red velvet. oh, thank you. i made this. take charge of your retirement. talk to a state farm agent today.

finally tonight, we remember bobbi kristina brown. she had the family name the family looks, and sadly now the little girl who followed her famous mother whitney houston around the world also followed her to the grave too young. >> come on. clap your hands. >> reporter: for bobbi kristina brown, music and fame were her birth right and her burden. ♪ the greatest love of all ♪ >> reporter: the daughter of whitney houston and basketbally y and bobby brown. their greatest love story, it was not. their daughter public highs, public lows. at 11 months old at american

music award she couldn't resist at lure of the microphone. >> didn't do that. ♪ bobbi, my baby ♪ >> reporter: seen here in concert in 1987, the family opened up to diane sawyer. >> perfect life for whitney houston. >> sitting. looking at my daughter grow up. >> she sings a lullaby? ♪ i love you ♪ >> reporter: a tragic end for whitney houston. found dead in a bathtub at the beverly hilton hotel in 2012. three years later, a similar fate for her daughter. bobbi kristina brown, found face down in her bathtub at home in georgia. ♪ and i will always love you ♪ "i will always love you" love between mother and daughter.

brown opened up to oprah winfrey after her mother's death. >> what's getting you through it? >> i can hear her voice and spirit talking to me telling me "keep moving baby." you know i am right here. i got you. >> reporter: private moments of grief found their way into the spotlight this time on lifetime's "the houstons on our own." >> this is mother's day weekend. >> reporter: last night the struggles, the demons whatever they might have been stopped. brown pronounced dead at age 22. her father bobby brown releasing this staple. krissy was an angel. i am completely numb at this time. a flood of sympathy. oprah winfrey writing peace at last. ♪ i look to you ♪ ♪ i look to you ♪ >> reporter: with countless hits like "i look to you" fans of whitney houston long hoped her daughter would find in life what she was looking