Good catch jrl767 right after I said Dec, 19 yr old informed me his winter break is for 7 days only - hence the move to make it summer.

SFO777 - thank you for looking it up - really helps. Kolkata is hot, humid and muggy in aug - but this trip is for my dad to see his grandkids, possibly for the last time

x007 - that is the main concern - I can see long calls with AA quite a few times before we fly knowing how often there are changes.