What is the ruling on praying Fajr on an airplane if the Qiblah is behind the worshipper with a slight deviation, given that the airplane crew does not permit prayer inside the airplane?

If facing the Qibla (definition) is not possible on an airplane, or if standing and prostrating are not possible, then it is permissible for the worshiper to pray without facing the Qibla, or while sitting on a chair, indicating bowing and prostration, with the prostration being lower than the bowing. The conditions and pillars of prayer are waived for one who is unable to fulfill them. As for the crew preventing passengers from praying, this means preventing them from praying in certain areas like the galley and aisles, not preventing them from praying in their seats.