I vote for Ethan as the ONLY possible in flight culprit. I just do not see a flight attendant getting through the floor of the plane during flight NOR do I see "plane personnel" flying with the bags and risking pressure and temperature issues...but maybe I am to common sense inhibited

(yes, I know that some baggage cabins holds are pressurized but my pound bag of Dunkin Donuts coffee ALWAYS arrives totally sucked free of air and like a rock until I open it and hear the WHOOOSH)