right now delta airlines is the only one of the four major u.s. airlines that is not requiring employees to be vaccinated. delta pilots union is instead telling employees it supports your individual right. but other major companies are taking a different stance. american airlines is giving its workforce a simple ultimatum, get vaccinated or get fired. but with holiday travel season around the corner, can the airlines keep up with the expected travel surge. cnn's pete muntean has more. >> reporter: american airlines has set the deadline for its employees in the united states to get vaccinated as the day before thanksgiving. it's the timing that is so interesting here, because the wednesday before thanksgiving is typically the kickoff to the busy holiday travel season, american will not say if that is intentional, but the airline is going one step further than other vaccine mandates. it's requiring employees get vaccinated fully by november