Just had a schedule change advised which reduces my ORD cnx to 90 mins. Flying MUC-ORD-IAH-GIG on Sat 31Aug now arriving 15:40 in T5 and departing T1 @ 17:10. I'm flying J and only carry on. No access to GE as not a US citizen.

Should I be looking at alternatives now, or just have an on the day back up. This is part of a carefully calculated MR which leaves no scope for reduced mileage.