It is not just April. We leave on May 2nd and they changed our flight (#2478) out of Charlotte from 9:40 to 11:42. On the way back on May 9th, they changed the flight from 12:40 to 2:25. On both flights they changed our seats from preferred to cabin. When I called and asked to be placed back in the same seats we originally had, they charged us $180 for the same seats. We are trying to start using Delta, or United for future trips.