[Uzin]

This is my Spitfire air.ini block:
SpitfireMkI air.SPITFIRE1 1 NOINFO gb01 SUMMER
SpitfireMkIX25lbs air.SPITFIRE925LBS 1 NOINFO gb01 SUMMER
SpitfireMkIXc air.SPITFIRE9C 1 NOINFO gb01 SUMMER
SpitfireMkIXcCLP air.SPITFIRE9CCLP 1 NOINFO gb01 SUMMER
SpitfireMkIXe air.SPITFIRE9E 1 NOINFO gb01 SUMMER
SpitfireMkIXeCLP air.SPITFIRE9ECLP 1 NOINFO gb01 SUMMER
SpitfireMkIXeHF air.SPITFIRE9EHF 1 NOINFO gb01 SUMMER
SpitfireMkLFXIVE air.SPITFIRELF14E 1 NOINFO gb01 DESERT
SpitfireMkVb air.SPITFIRE5B 1 gb01 SUMMER
SpitfireMkVbCLP air.SPITFIRE5BCLP 1 NOINFO gb01 SUMMER
SpitfireMkVbLF air.SPITFIRE5BLF 1 NOINFO gb01 SUMMER
SpitfireMkVbLFCLP air.SPITFIRE5BLFCLP 1 NOINFO gb01 SUMMER
SpitfireMkVc air.SPITFIRE5C2 1 NOINFO gb01 SUMMER
SpitfireMkVc4xH air.SPITFIRE5C4 1 NOINFO gb01 SUMMER
SpitfireMkVcFB air.SPITFIRE5C2FB 1 NOINFO gb01 SUMMER
SpitfireMkVcLF air.SPITFIRE5C2LF 1 NOINFO gb01 SUMMER
SpitfireMkVcLFCLP air.SPITFIRE5C2LFCLP 1 NOINFO gb01 SUMMER
SpitfireMkVIII air.SPITFIRE8 1 NOINFO gb01 DESERT
SpitfireMkVIIICLP air.SPITFIRE8CLP 1 NOINFO gb01 DESERT
SpitfireMkVIIICLPFB air.SPITFIRE8CLPFB 1 NOINFO gb01 DESERT
SpitfireMkVIIIFB air.SPITFIRE8FB 1 NOINFO gb01 DESERT
SpitfireMkXII air.SPITFIRE12 1 NOINFO gb01 DESERT
SpitfireMkXIVC air.SPITFIRE14C 1 NOINFO gb01 DESERT

It seems to be the same as your is, and I have no troubles.
Perhaps it will help you, I hope.