I recently booked two separate trips - OKC-YYZ (via DFW), YYZ-VNO (via LGA, JFK). First trip was canceled pretty much last minute. I had to make my own last minute arrangements to get to YYZ for next morning departure (to avoid missing first leg of the trip and risking canceled reservation). Since there were no suitable flights on AA and United, had to fly on Delta (paid $680 for one-way flight in business, cause economy was only $100 less and I would need to pay for bags, cause have no status with SkyTeam). Next day, flight YYZ - JFK on AA was also canceled after a 3 hour delay and I was going to miss my flight from JFK to HEL. I was scheduled to fly on Lufthansa YYZ-FRA-VNO. I requested an agent to book me specifically in Y class so that I could earn 150% miles on A3. My request was accommodated. All in all, I got to Vilnius on time, but it did cost me an extra $680 which AA refused to reimburse and caused some stress.