commands.flights.delete_flights: use selector helper
commands.flights.delete_flights: use selector helper

skylines-project/skylines,RBE-Avionik/skylines,Turbo87/skylines,snip/skylines,skylines-project/skylines,shadowoneau/skylines,RBE-Avionik/skylines,skylines-project/skylines,kerel-fs/skylines,shadowoneau/skylines,Turbo87/skylines,Harry-R/skylines,Turbo87/skylines,TobiasLohner/SkyLines,Harry-R/skylines,snip/skylines,kerel-fs/skylines,Harry-R/skylines,TobiasLohner/SkyLines,kerel-fs/skylines,RBE-Avionik/skylines,Turbo87/skylines,shadowoneau/skylines,TobiasLohner/SkyLines,RBE-Avionik/skylines,shadowoneau/skylines,snip/skylines,skylines-project/skylines,Harry-R/skylines