JetBlue vs United vs American?

I live and work in coral gables, florida and my company just told me they're going to ask me to fly up to northern New Jersey about once or twice a month for a meeting with another branch's employees. I'm getting a raise but the flights will technically be out of my own pocket. I'm considering which airline would be the best option to become a member with and fly with most or all of the time. JetBlue only flies to Newark from Fort Lauderdale which is further from my house. United and American both fly from Miami but they're both pretty bad Airlines, so what balances it out would be the loyalty programs. What should I do?

Is it time for a new Concorde type airliner?

That solves the fuel tank safety problem,
that can carry more passengers (a bit larger),
that can travel even faster,
that primarily flies over the oceans,
that can efficiently go subsonic near airports (reducing sonic boom problem).

The Concorde did make a profit.

What baffles me is. If Helios Airways flight 522 ran out fuel, how did it explode, when it hit the ground? It makes no sense to me?

Some of you may remember the crash of Helios Airways flight 522 on August 14, 2005, but what I still don't understand is if the plane ran out of fuel and lost power in both engines, you d think when it hit the ground there would be no post crash explosion or fire, You d think it would ve just broke apart and large parts of the fuselage would be intact, but for some reason despite it not having any fuel at all it still exploded on impact, it's a question that baffles me to this day. I hope someone who's an expert on airliners or airplanes in general can answer this one, But I watched a documentary and red articles clearly stating that both engines had flamed out before the crash, so I wouldn t be questioning it if I one engine quit, and one wing still had fuel. But if both sides are empty of fuel, then It seems it should be physically impossible for the plane to explode with empty fuel tanks.

LAX AIRPORT CONNECTIONS CONFUSION / TIPS FOR FIRST TIME FLYING ALONE Please?

I will be flying by myself for the first time to San Diego at the end of May. However, my flight has a stop at Los Angeles before I reach San Diego.

My flight from LDN to LAX is with Virgin, and my flight from LAX to SAN is Delta.

I have been told by one of the workers at Virgin that when I reach LAX, I will have to claim my checked luggage, then re-check it in again with Delta airlines as the airport will not transfer my luggage over for me. (Something to do with American security I suppose? That's what the lady said)

I'm VERY nervous for this as this is my first flight alone and I was not aware that I would have to claim my luggage at LAX and re-check it in even though LAX is not my final destination.

Has anyone else had to do this before? Is it a straight forward process? Is it easy? Are there plenty of signs/staff around to help out? How did you calm yourself for your first flight alone?

Any tips concerning my issue at LAX or just tips for flying alone for the first time in general would be great, thank you!