easyjet
GayFriendly
They have also gone to some trouble to operate these flights.
BHX - Corfu uses two Belfast aircraft to ensure no crew positioning back and forth - Aircraft one leaves Belfast for Corfu then turns around for BHX then onward to Belfast and aircraft two leaves Belfast for BHX turns around for Corfu and back to Belfast. I bet that is quite tight on crew hours.
Alicante is operated by an Amsterdam based aircraft routing AMS-BHX-ALC-BHX-AMS
Palma, Faro and Malaga are straight away based flights.
I hope this is leading to a base in 2022 and not just taking advantage of the fact that the UK is ahead of the game on vaccinations. Not sure I would be looking at certain parts of Spain this summer.