> I'm also pretty sure that there aren't many regulations on flight numbers. And generally there are so many flights airborne in UK airspace that the published

> I'm also pretty sure that there aren't many regulations on flight numbers. And generally there are so many flights airborne in UK airspace that the published flight number isn't the one given to ATC. For example, EZY26FR currently overhead my location is published in the timetables as EZY602, but that number can be easily misheard, misquoted or subject to namespace collision on the radio so the airlines are encouraged to use alpha-num callsigns instead. It really annoys me as someone who likes consistency. Why not just publish the actual callsign in the timetable instead of maintaining two systems and cross-referencing between them?