A week or so ago, I was reminded to check my flights (leaving end of August for LHR and on to the continent). All was well. I booked on British Air using Alaska Air miles in February, getting a terrific non-stop SEA to LHR flight.
All was well until today, when I was looking at Alaska's site for another purpose. I noticed a banner telling me that there were changes and I had to call. Checking the BA site, I could not longer pull up my reservation as there were "no flights." Yikes! Luckily Alaska has stellar customer service and without even a wait on hold, an agent laboriously worked through options with me to ensure a successful outcome. We will leave 5 days early and will need to fly to SFO to get the overwater flight. While it will be a long long day getting to GVA. there are no tight connections. Whew! I can handle five extra nights in Europe.
You cannot check too often. Why on earth can't the airlines -- and I fault both BA and AK -- manage to spew out an email advising you there are changes? It is a fully automated function to advise electronically so there is, IMO, no excuse.