What's your home airport?
You can go onto the Jetblue website (or the wikipedia page for your airport) and get a rough idea of where jetblue flies from there.
I don't transfer points even during a promotion unless I have at least a rough idea of how I will use them.
If you are reasonably sure you gonna use jetblue in the next 6month to a year, go ahead. if not, you can always wait for next round of bonuses.
Also check the jetblue website and see how much points is needed for a typical trip. You don't want to transfer too much and waste the extra points in the account.
If you fly AA, why not transfer MR to BA and redeem on AA flights? BA booked short AA domestic flight is just 9k avios one way plus 5.6USD fee. Right now there is a MR transfer bonus to BA at 1:1.4 (ends tonight), easily net you 2+ cpp.
Although, do keep in mind if you only fly between big hubs, cash price is typically very cheap and hard to beat, lol
Ive noticed some very cheap flights using points compared to cash, but I've only searched so much. Are u saying cash is usually cheaper than points with most big hubs? The only one I booked (last months Vaca)was over $300 per round trip ticket I got for 11,000 points. Delta, and see aa has many for 10-14k
If you are flying between hubs or direct flight between large cities, e.g., BOS-LAX, BOS-NYC, the cash price for economy is just around 100-200 RT, its hard to find award booking that provides 2+cpp on these flights.
Obviously, you always want to do search first for your specific trip and see if award flight give you good values (I use kayak for cash price search, and use awardhacker for award cost search). The one you got (11kmiles for 300 USD ticket), for example, was of excellent value.
Regarding previous post, yes, you can book AA domestic flights through BA award (avios) booking. However, first, you need to goto BA, register an account and search some typical flights (those you likely to take) and see how availabilities and costs look like.