Regional airline Flybe, which was recently saved from bankruptcy, has continued to struggle this morning, following the cancellation of dozens of flights.
Blaming “operational reasons”, five flights from Belfast City Airport and four from Birmingham are among those affected.
Flybe passengers on departures from Southampton, Aberdeen, Edinburgh and Newcastle have also seen disruption.
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.
Flybe was bought early this year in a rescue deal following poor financial results.
Connect Airways, a consortium led by Virgin Atlantic, paid a total of £2.8 million for Flybe’s assets and operations.
The Exeter-based carrier put itself up for sale last November, following a profit warning the previous month.
Commenting on the news, Rory Boland, Which? Travel editor, said: “Thousands of people will understandably be frustrated to have their travel plans thrown into chaos by these last-minute cancellations – and the lack of clear information provided by Flybe was completely unacceptable.
“All passengers affected by these cancellations are entitled to a full refund or to be rerouted on to another flight to their intended destination – and to over £200 compensation under European air travel rules.”