Jet Blue Leap Day Sale , $29 One way flights on Feb 29th subject to availability (booking ends today)
http://www.jetblue.com/deals/leap-day/
e.g SFO -> NYC , SFO -> FLL etc
Via: https://slickdeals.net/f/8480129-jetblue-promo-fly-from-coast-to-coast-for-29-one-way-valid-for-flights-on-2-29-only
Getting back however ...