Originally Posted by Raisor
He was using a remote from another location, he was never in the cockpit
He wasn't flying it remotely, or else the autopilot wouldn't have been a plot point. The assumption is that he was in the cockpit, turned the autopilot on, and then ejected. The filmmakers decided to go with the tired old trope of showing the bomb timer ticking off the final few seconds before the explosion, even though our hero had miraculously escaped before that.