I admit I wasn't watching closely enough, but when Seagal curtly insisted that Oliver Platt go right up into the airliner instead of doing what he had to do from the ladder (the case Platt was pleading), was there any reason given for Seagal's insistence or was it just to get Platt's character into the Jumbo for the sake of the story?
He needed to secure the connection between planes and put some kind of docking clip in place so as not to trigger an alarm in the cockpit of the airliner. It was implied that Seagal and the other commandos didn't know how to do this. Although it was also clearly a plot device to get him onto the airliner.
The reason is about timing. You need to get your men up and into the plane as fast as possible, in case anything happens, as was shown. How many would they have gotten up there if they waited for Cahill to go up, clip it, then come back down, then let Baker up?
Yeah, we'll have to assume that Seagal didn't give a *beep* about whether Cahill was stuck in the airliner or not, and may just have had him climb back down after if time had allowed.
Although Cahill was quite out of shape lol, it may have been quicker to just let him drop back down that trying to stuff himself up through the hatch.
Another point, and correct me if I'm wrong, but did Cahill apply the clip? I seem to recall one of the men did it without any direction from Cahill, but maybe I'm misremembering it. Having missed the reason for Cahill going aboard, I wasn't taking enough notice.
I've edited this a couple times, I'm quite sleepy, so if you read the first versions before I edited, disregard the stupid.
No, because the Remora had never mated with a civilian airliner he had to go up and check the seals, pressure gauges, etc...to ensure a successful dock.