Passport Expiration issue:
I booked a 1 week trip from SF (US) to Hong Kong and just realized that my Passport expires in February (13th).

Departure:
My flight is to Hkg is on Nov 5th and then another flight (different airline) to Manila (Philippines) the next night (Nov 6th).

Return dates:
Nov 11: Manila to HKG
Nov 12: Hkg to US

Time between trip (#1) and PP expiration date: Nov 12 (return date of trip #1) to Feb 12 (PP expiration date) exactly 3 months.

But I also have 2 other international flights to HKG planned for November (reason for 3 trips in 1 month = taking advantage of Delta Skymiles promotion Detroit to HKG).

Must I renew my passport before going on these trips or can I wait until after I have completed these 3 short trips and do it then?