Migration Timeline
27 march - all airbus 767 and T1 1/3 longhaul routes move to T5
BEG moves from T4 to T1
WAW moves from T1 to LGW
30 march
IAH/DFW move from LGW to T4
ALG moves from LGW to T5
DTW terminates
30 April
All T4 flights move to T5 (except ISA including BKK SIN and SYD)
21 June
All T1 flights move to T3
BCN BEG HEL LIS MAD NCE
14 Oct
Remaining T4 flights (Jsa) move to T3
Is that any clearer?