flight.js: add 'removeFlight' method
flight.js: add 'removeFlight' method

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