Thanks Piper, valid points. Yeah, they're separate tickets. Flying in on a BA flight at 330am and connecting to Indigo on a separate ticket at 610 now changed to 555. I had 2 hours 40 minutes to get through immigration and customs and check in for the domestic leg at Chennai and now its down to 2 hours 25 minutes and I'm getting antsy. According to some people, this is still enough time if everything runs smoothly at Chennai. You're right, I should have played it safe and booked the next flight 4 hours later. I usually err on the side of caution but in this case I just anticipate wanting to get to my final destination given the ungodly hour. It does remain the case, however, that every other airline I've flown with offer free rebooking on another flight on same route when the carrier imposed rescheduling isn't convenient.