a representative from the federal aviation administration tells kron 4 the asiana 2, 1, 4, crash forced to look at how aircraft rescue teams respond to emergencies, how they are trained and what kind of equipment is used. san francisco airport officials say they've made major investments in emergency preparedness. sfo now has a boeing 7, 6, 7 aircraft that offers emergency training and an airport rescue fire fighting simulator among other new resources to help prevent another tragedy reporting in san francisco, stephanie lin kron. 4 news. >> developing this morning, canada and mexico responded with their own tariffs on the u.s.. this comes after president donald trump follow through with his promise to tax imports from the nation's top trading partners, trump approved 25% taxes on imports from canada and mexico. saturday. plus a 10% tariff on products from china, oil and energy products from canada will be subject to the lower 10% rate. trump says the tariffs are to stop the flow of fentanyl into the u.s.. he also wants canada and mexico to do more on their sides of the border. but the

. >> that's what happened less than two years ago on this asiana air flight en route to south korea, man opened the emergency door of the plane just before landing. >> people are cramming onto these airplanes and not always behaving well, especially after they've had a few in-flight drinks. the common theme through all of this is you have a system which puts people on edge. >> a few weeks. >> ago, a similar incident took place on a jetblue plane taxiing at boston's logan airport. a passenger opened an aircraft door, deploying the emergency slide. >> the air. travel system in. >> the u.s. is really bursting. >> at the seams. it's being. >> incredibly taxed. the sunday after this past thanksgiving, there were 3 million people on commercial flights in the u.s. in one day. we're talking about the population of los angeles, of people flying. >> pilot error has led to a number of well-known crashes. in 1994, pilots on china airlines flight 140 attempted to pitch the plane down while the autopilot was pitching the aircraft up. the plane crashed, killing 264 people on board. in 2001, america