If you receive Jet Blue credits if the price of your flight goes down, can you use these credits for anyone flying later or only the person they were originally issued to? My kids are coming on our next trip but if we receive any credits, my husband and I would take a trip alone next time. Can't recall if it's Jet Blue that lets you use them for anyone or if it's Southwest. I keep getting the 2 mixed up as far as certain details. Thanks.