If you have an American Express there are a few offers ( I have the Blue Cash card) offering significant savings. Jet Blue, Delta and UndercoverTourist all have some great deals.
We have all of these - plus a few more at Hilton, MGM Grand in Vegas, etc. - on my husband's Blue Preferred Card. This is anecdotal, but out of the 5 Amex cards my husband and I have between us, the Blue card is consistently the best in terms of offers we can actually use. In the last few months we've had Blink Fitness, DryBar, UndercoverTourist 2x, Hulu, ebags, and a few more. The card easily pays for itself even before considering the 6% back on groceries.
Rats! I had the Jet Blue a couple of days ago but don't need it; Undercover Tourist and Busch Gardens Tampa. The one I'd use (Delta) of course not on my offers. Still, I check daily in case AmExp figures out I don't buy a lot of clothes/perfume/candy and like travel, travel, travel