This question already has an answer here:
Two months ago we were traveling to Japan. After checking in the luggage we realized that we forgot the voucher for the Railway Pass at home so we hurried back to the city to get it. But pure luck we got back just before boarding even started.
But we were curious recently. What would have happened in a parallel universe, where we didn't make it back on time? I know that they are not supposed to take off without you if you've checked in your luggage. But I guess that at some point they will do something about this.
Just to give a full account, there were no further flights from the airport to the connecting airport (where we had to spent a few hours anyway, so if there was a second flight two hours later, it would have been fine); and we weren't physically at the airport for the most part.
So what would happen if we had only managed to get back to the airport 30 minutes after boarding, an hour after boarding, or even two hours (say due to a minor train accident or whatever)?
(The airline was Turkish Airlines, if that matters, and we were flying from within the EU.)