Regional airline Flybe has cancelled dozens of flights on Wednesday morning for what it describes as “operational reasons”.
Five flights from Belfast City Airport and four from Birmingham are among those affected, along with departures from Southampton, Aberdeen, Edinburgh and Newcastle.
Most of the flights are within the UK.
The airline said it would like to “sincerely apologise for any inconvenience caused”.
“All customers affected have been emailed and advised they can rebook for travel on an alternative flight or apply for a full refund,” the company said in a statement.
Customers vented their frustration on social media.
@flybe very much doubt I will be using Flybe again. Flying from Edinburgh this morning:
Birmingham 0700 delayed.
Southampton 0729 cancelled
Cardiff 0840 delayed
Heathrow 0850 delayed