Suspension of disbelief is complex
There's varying degrees of suspension of disbelief.
Doctor Who the character, and his Tardis etc. are completely outside of the real world, so it's easier to suspend disbelief over what they are and do.
An aeroplane is something familiar, earthly. So I need whatever happens to it not to be too far away from that familiarity - unless of course, the event is CAUSED by the unearhly..