Originally Posted by
phkc070408
As someone who books flights 8-9 months out, I'm constantly seeing schedule changes and the ability to make a one-time change without paying the fare difference. While I don't know the minimum time difference, I've seen this for schedule changes well under 4 hours.
I just got notified a flight 6 months out changed the flight number and the reservation is eligible for a no charge change. No change in the departure or arrival times, just a flight number difference