I will throw my 2 cents by stating that I heard that if the strike were to last more than 3 days. Its GOODBYE to DL. On the non-rev side of things, non-reving would be very difficult for any airline employee to non-rev even on their own respective airline. For non-rev passengers flying on a DL guest pass, if Delta were to strike, no other airline will allow you to non-rev on DL guess passes. The buttom line, you will be on your own. My guess is that if DL pilots were to strike. It would be within a few days before or after Easter. When employees are threatening to strike, they try to schedule work stoppages and CHAOS around a busy travel time. With so many passengers traveling on spring break this is the time to do it. DL will be busy reaccommodating DL paxs on other airlines. Furthermore, with most U.S. based airlines have reduced or limited capacity growth on U.S. domestic routes in order to have higher yields. So I imagine most airlines will not add any extra flights with the exception of a few highly concentrated/profitable DL markets. The airline I work for is experiencing very strong booking where Delta has a strong presence. This is very typical when airlines are faced with a possible strike. Passengers get the "Fear Factor" and avoid the airline until labor disbutes are settled.