No easyJet flight to Antalya, they serve the other destinations mentioned.
Have a look at the BRS easyJet thread (see below link) #484 of 16 January 2017. The gaps appear in July and August.
http://www.forums4airports.com/threads/99/page-25
I'm not aware of a 15th aircraft at BRS this summer. It was announced some time ago that aircraft number 14 would arrive for the summer (13 in summer 2016), and looking at the schedule the 14th aircraft is utilised, although as as been mentioned once or twice July and August are down on early summer on overall flight numbers as things stand which leads to head scratching.