js/slFlightDisplay: Simplify flights array observers
js/slFlightDisplay: Simplify flights array observers

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