I know it doesn't seem logical BUT since the meeting is at an airport AND Elon has talked about an electric plane AND on their last earnings call they mentioned they were working on some very exciting things, is it just possible they may reveal an electric plane?? I am talking a smaller electric plane - not a jumbo jet, one that would carry 2 to 4 passengers.
^ This is my favorite idea so far! As you say, Musk does plan to do that but I'd say there's roughly zero chance of it now, at this point in Tesla's life. Unless it's an R/C Tesla plane.