Your outbound flight was delayed less than 2 hours which caused you to misconnect. You may view that as a 6+ hour delay in aggregate, but Jetblue probably won't see it that way. Again, there are no hard and fast rules here. You can threaten small claims court, arbitration, complaint to the DOT, etc. They are not just going to roll over and hand you $600. You're going to have to push them for it. Again, it depends on how much time you want to spend on this.