FWIW...Last year during Indoc at United, the chief of hiring spent a few minutes talking to us and answering our questions. He emphasized for us to pass along to our buds that while their app was 1 of the 10,000 in the pile for consideration, their Class 1 needed to be current. He said that if the computer spit out their app as someone to call in for an interview, but he noticed that the physical was expired, he would simply skip them and move on to the next in line since a current Class 1 was a requirement for employment. You can argue all you want about "when" it should be required...but all I know is what the main hiring guy told us.