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G-BTMU is a Thunder AX8-105 S2 hot air balloon, built in 1991 and registered in the UK. No public sightings of G-BTMU have been logged yet. There is one photograph of it in the archive.
Also written G BTMU or GBTMU.
UK civil aircraft register, 6 Sep 2026
First photographed here by H-P Wohlfarth on 7 September 2026.