I've been an E+ for several years, and managed to use all of my vouchers to upgrade to J. My renewal date is March 31, 2015 and I've already used my vouchers for this year. Does anyone know if I book a flight now to fly in April, can I use my next year's vouchers for the April flight immediately, or do I need to wait until after March 31st? Obviously, if I have to wait until April 1st to use the upgrade vouchers on an April flight, the likelihood of any J availability is nil (I'm flying out of LAX).