I noticed on the UAL web site that they offer "Premium First Class" on Transcontinental Flights from JFK to LAX. I make a weekly commute from BOS to LAX. I'm wondering if it might be worth it to make a connection at JFK. My BOS-LAX flights are always two class flights and I'm at about a 50% upgrade percentage (Premier Exec). Does anybody have experience with "Premium First Class" on these flights? Is it worth it?