issue before. it's not in an area that takes a tremendous amount of heat. it should not be a showstopper, but the engineering teams are looking at that just to make sure and see if they can cover it up with something or what they're going to do about that scrape on one of the thermal tiles. "endeavour" making its 25th flight. it is the youngest of all of the space shuttles and it has had a tremendous career. >> reporter: "endeavour" the newest of the orbiters, might never have been built if not for a terrible accident. in the aftermath of the loss of "challenger" in 1987 -- >> so -- well, the "endeavour" is, again, as i was saying, might not have ever been built except for the fact that "challenger" accident, after that, the president ronald reagan said we will continue on, we will press on, "endeavour" was then built and flew most of