I travel on business 3-4 times a month and collected thousands of miles on the above airlines, which I can sell for BTC
The best method is to PM me your travel details (better to be flexible, but can work with any date/time)
I will get back to you with a quote in BTC at current trading price- of course I will adjust price at time-of-sale for inflation.
I also have 5 JetBlue vouchers. These are valid for travel between any US city to Any US city. Some of them have expiration dates, so let me know your travel dates.
To book your flight, I will email you a PDF of the voucher with the Authorization number on it and the JetBlue telephone number to book the tickets (can't be booked online)
Once you verify the auth number by calling JetBlue, you release the BitCoins via escrow on ClearCoin
The current price for a voucher is: 19 BTC
For payment, you can create an escrow account on ClearCoin.com, once I'm shown the status page with my BitCoin address, I will book the tickets in your name, or send you the voucher.
I would prefer to sell to someone with a reputation in the marketplace.