I've travelled on airliners through major English airports in both my Freedom Kilts or in a denim Union Kilt several times this year. Had to remove my belt and sporran to go through security otherwise no problems. However I wear these no-traditional Kilts without kilt pins and would be interested to hear how others handle the issue of kilt pins on a traditional tartan wool kilt. One solution I've seen is a sew on patch in place of the usual kilt pin.