Every single one has had this happen. Delta by memorial day, Alaska Airline in May, a whole bunch of them Aug 7, and June 17-20, Apr 3. I happens quite frequen

Every single one has had this happen. Delta by memorial day, Alaska Airline in May, a whole bunch of them Aug 7, and June 17-20, Apr 3. I happens quite frequently, but unless you follow airline news, or you were personally impacted you would not necessarily know.