Summer travel season should suffer most since some routes will cease operation as early as June 9th. The bulk of these destinations are leisure destinations, but it will still lead to upset passengers. Early on in the airline cessation, Belfast takes the biggest hit as it is completely shutting down next month.
The rest of bmi baby operations will close up shop no later than September 10th with customers being either re-booked or offered refunds. bmi main line service will continue to fly until BA finishes the merger, so if part of your summer vacation plans involved bmi, you might still be in luck. For more information, have a look at the full details here.