Maybe, but as they do not offer 10 GBP Tickets in great numbers, they would be struggling to fill their Fokker 100s without the business traveller who could best be in the City at 12:30 or 1 pm - without an option to return on the same day as the afternoon flight would have to depart STN 4 pm'ish. And quite honestly, before you will Air Berlin flight's from STN to BLK, they will try the likes of EDI, ABZ, DUB or LBA.