Last year my father had a motzai shabbos flight with elal and the pushed the take off time a little earlier leaving no nine to make it to EWR on time for the flight so he called them and complained about them officially not flying on shabbos and now he can’t even make it to the airport on time and they switch his flight for free to the Thursday before
My point is they officially don’t take off on shabbos but all the preparation does happen on shabbos