re: Frequent big flight changes

Do not call. The reps are using the backend of the same app your Delta, United, AA, Lufthansa app are, except you have to wait to talk to someone. I've been screwed in Chicago, looked at 50 people in line at United customer service, and rebooked in under 90 seconds from my phone.

The schedule changes to me are not bigger than an equipment change. That completely wastes the seat selection process that I probably paid for. Down-gauging from a 777 to a 767? Moving from a 787 to a 777-200? That induces near panic on my part, because if the seat configuration isn't the same, it's seemingly a free for all. Saying my flight is going to leave 2 hours later, but on the same metal? Meh.

I don't know what you're flying, but if you're working with someone like Southwest (SWA), where the flight originates from can make a shocking amount of difference. For example, flying from Dallas to Hobby, there is a flight every 30 minutes (but yeah, we need a high speed train?) However, if the plane was coming from El Paso into Dallas, takeoff was delayed until AFTER the flight that came in from MSY, every single week. The 5PM flight from El Paso would often leave over an hour after the 5:30 flight that originated in from New Orleans (El Paso seems to have a lot of wind which delayed ops.) After the first time, I figured it out, and never booked that 5PM flight again to avoid the scramble.