I just made a quick overview of the currently assigned based aircraft for the upcoming winter season. It is most likely not complete, since the total number of based aircraft is 333. Please let me know if I've missed a base. The data is based on the first full week of November.
1. STN (35)
2. DUB (25)
3. BGY (14)
4. BCN, CRL, MAD (13)
7. SXF (9)
8. CIA (8)
9. FRA, MAN, OPO (7)
12. AGP, BLQ, TFS (6)
15. ATH, EDI, EIN, KRK, PSA (5)
20. ALC, BRU, CGN, EMA, HHN, LBA, LIS, LPA, MXP, VLC, WMI (4)
31. ACE, BHX, BRS, BUD, LPL, LTN, MLA, NRN, NYO, OTP, PMI, PMO, RAK, SOF, SVQ, WRO (3)
47. BFS, BRI, CAG, CTA, FCO, FEZ, GDN, HAM, KUN, NUE, PRG, SKG, SNN, TPS, VNO (2)
62. BRE, BTS, CHQ, FKB, FMM, GLA, GOT, GRO, NAP, ORK, PDL, PFO, PIK, POZ, PSR, SCQ, TSR (1)