Factual error: 747's do not have overhead crawl spaces.
Suggested correction: I was just looking at the overhead crawl space in a Lufthansa 747 at Am Technik Museum in Speyer, Germany. There is space.
There is a very small space above the ceiling panels that does not match the movie, and would never hold the weight of a person.
Factual error: When the fighter jets get ready to shoot down the jumbo jet from behind, Baker sends a Morse code message via the plane's rear lights to the fighter pilots. From such a short time of the fighter pilots viewing the message, they were able to immediately decode it as "Hail Mary, Alpha 1, 10 minutes. "Message repeats" says fighter jet pilot. Wouldn't it be impossible to send such an elaborate message via Morse, let alone be decoded so quickly and repeated in such a short time?
Suggested correction: Very much like texting, a Morse code message doesn't have to be spelled out in full to be understood, and someone who is fluent in Morse would certainly be able to translate on the fly. I don't know enough morse to read what was used in the movie, but sending something like "hail mry A1 10 min" would certainly get the point across. It's also unlikely that "Message repeats" was actually signalled... it would just be that the first bit was repeated several times.
Other mistake: How come when they are on the Remora F-117x the pilot is the only one wearing an oxygen mask? The team only has headsets on but they're all in the same space - just before they dock, Kurt and Steven stand up and move forward straight into the cockpit area next to the pilot.
Suggested correction: The plane is pressurized - Cahill has to equalize the pressure before entering the sleeve to access the 747. That would not preclude the pilot from wearing an oxygen mask in case pressurization is lost.
Plot hole: When the fighter jet broke off from the 747, Steven Seagal died but the pilot ejected and was not killed. The people in Washington don't know that the team made it on board the 747 until later when they got signalled with the plane's tail lights, but the fighter pilot that ejected would have told Washington that the team made it on board.
Suggested correction: That would depend entirely on where he landed and how soon he was rescued.
Suggested correction: He ejected from 35,000 ft. He didn't survive.
Continuity mistake: Mr Grant is at a dinner party wearing a tux. Then he is in a meeting, and told they must fly within an hour, but it is during the day.
Suggested correction: Everything you mentioned happens during daytime hours. When we see the establishing shot of Washington DC, the sun is up. Although Grant is in a tuxedo, it is not a dinner party. In fact, while he is talking to the woman, it is daylight outside. He then rushes off to the Pentagon, and then to the airfield, all which happens during the day.