I highly doubt we will see any alliance membership anytime soon. My bets are on JetBlue joining an alliance before any of the other LCCs. What I do see them doing is gaining an international partner or even a domestic one (AA was thrown around) that they can give their flyers international access. Since I don't see them starting long haul service anytime soon it would make sense to find a partner willing to fly to DEN or MKE or provide easy connections through a city on either coast. Another idea would be to fly MKE-SJU and DEN-SJU and codeshare with Eagle to give their flyers access to central america and the carribean without having to start their own flying.