So where will they expand or will these replace older frames ?
Bit of both. They retired a few of the B733's this year, leaving either 11/ 12 in the fleet, which look to only be in BFS, EMA, LBA and NCL at present. NCL may also be an all B738 base from Feb (can anyone confirm?)
The last New B738 is due in January. This and the other 2nd hand's will help with expansion, mainly in MAN/BHX/STN i'd guess