Most of the flights are cargo or passenger planes with no passengers but full cargo holds - price of air freight has soared(sic.)which makes it economical to do this - also means pilots and planes retain their license to fly - pilots must do at least 3 take offs and landings every 90 days to retain their license. Airlines need to have a cohort of licensed pilots to fly when the restrictions are over.
Are you sure when the flight numbers are passenger flights and aren't specific freight planes ?
