I travel for business 150,000 miles a year. I AVOID JetBlue whenever I can. Here's why:

1) JetBlue refuses to participate in TSA PreCheck
2) Frequencies between some city pairs are so low that if they cancel a flight you are either stuck overnight, stuck for 10-12 hours or buying a walk-up fare on another airline. A $25 voucher is basically worthless in this situation
3) Getting through security at T5/JFK is the worst in the USA
4) I'm still sore about losing all my frequent flyer credits from True Blue iteration # 1
5) I have had as many poor customer service experiences on JetBlue as on United/AA/Delta
6)Jet Blue is the same price as network carriers but with fewer options

I have no idea why Jet Blue thinks I'm going to pony up for MINT from JFK to LAX when there are perfectly good options on AA/Delta/United on the same routes and I can't/won't use Jet Blue for my other flying. See 2) above