david malco, appreciate your reporting. tom foreman jinz oins me. >> just as we have been looking at the piece of debris all afternoon so have the experts at boeing. they have looked at the 7 foot by 3 foot piece. they see something in these pictures that tells them it's likely part of a 777. that's what the missing malaysia airplane was. what sort of part. let's roll it around and talk about this. our analysts have been looking at it and they say it would likely be part of the back side of within of the wings here. so the first criteria has been met here for a match. it is the right type of piece for this to be part of the missing plane. also the right color. we have talked about that a good bit. being the right color and the right condition. it is consistent with something that has been floating in water for some 500 days. we are waiting on the identifiers here. by that i mean some sort of serial number. because most big parts on big planes like this seat cushion from a different plane have serial numbers on them. if you

our david malco has more on the expedition. >> reporter: extraordinary moments as the solar impulse 2ched down on the tarmac in hawaii after a flight that lasted almost five days and five nights across the pacific ocean all the way from japan. remember this is a plane that flies without a single drop of fuel and it was piloted by one man, a swiss engineer andre borschberg flying in that cockpit all day and all night, alone, without a break, using yoga stretching and breathing techniques to try to relax, also taking 20-minute naps when the weather conditions allowed. there was one evening in particular when there was a lot of turbulence about four days into the flight so he didn't get any sleep at all. you can bet he's happy to stretch his legs and see his family there on the ground in hawaii. now, this is an extraordinary journey. it's an around-the-world trip that began in march all the way in abu dhabi, and this is just one piece of that journey around the globe. so now the team will turn their attention to the east across the pacific, towards the united states the mainland united s

our david malco listening into the press conference joins us now, live from hong kong. d. he said there are a number of markings and numbers on the piece of debris. he actually red out pb-670 one of the markings saying a possible maintenance number. wondering to you what stood out in what we just heard? >> it is interesting, errol. we are getting a lot of detail we weren't hearing before. we had a source saying that they believed that this piece was from a -- triple 7. we heard from a reporter on the ground. that there was a marking on it. a number look you said. what we are hearing from the deputy prime minister in australia -- the face of australia's effort in this. it is not a serial number. not a registration number. could be maintenance number. what this says is investigators and teams from australia, from the u.s. from france from boeing and other places are looking act this extremely closely. they're looking at every detail possible. trying to make a determination. you can imagine this really says this is active happening now. they want to get this right. errol, o