Do Delta 1 Fares to TYO ever get down in the 4K range? I've currently got a 5K fare I'm looking at, through ATL on the A350-900, with an excellent short transit time (only 1 connection), and I'm wondering if there's any reason to wait or should I just pull the trigger? If I should cancel later and have to re-use the flight credit, can I book a cheaper flight and still have a residual credit without penalty? Sorry for the newbie questions, but I just made Plat last year and am a new DL flyer.