Added check for aircraft column.
Added check for aircraft column.

jprochazka/adsb-feeder,jprochazka/adsb-feeder,jprochazka/adsb-receiver,jprochazka/adsb-receiver,jprochazka/adsb-receiver,jprochazka/adsb-feeder,jprochazka/adsb-receiver,jprochazka/adsb-feeder,jprochazka/adsb-receiver,jprochazka/adsb-feeder