Are there no other airlines who fly STN - IBZ? (eg. Easyjet, Thomas Cook, Thomsonfly etc.)
There are certianly no winter charters, and I doubt EZY do either
The reason is probably why FR have axed their winter flights. Demand to the Balearics in winter is very low and a hard market to make work. So Spanish mainland links for the locals may do OK, and Air Berlin's PMI hub keeps going, but point 2 point routes to mainland europe are a lot harder to sustain
As a comparison Jet 2 don't serve PMI in winter, Thomas Cook don't. Thomson only do in a limited way, Monarch scheduled are only launching their first winter PMI flights this year. While for Menorca their only UK link in winter is Monarch