Passengers at Belfast City Airport have been left fuming after two flights to Heathrow were cancelled at the last minute this morning.
The British Airways flights were due to depart at 10.10am and 11.50am.
Sources say passengers have been trying to get information as to what happened, but there were no BA staff at the check- in desk.
It is understood passengers travelling to London for the Conservative Party conference are among those impacted, as well as some due to catch international connecting flights from Heathrow.
BA has been contacted for comment.