Just seen your 'What's your favourite Aircraft' post.
For me it is the B25 Mitchell. What a great aircraft that was, it had good looks and was so virsatile (ok so I can't spell!!) . There are still a number flying in the States, you can even get to fly in one if you have a spare $250, or $400 in the co-pilots seat.
Commercial airliners, the 747 is my choice, they are as solid as a rock.
The USA is the place to be if you want to get up close. I have been in a Shackleton, a B17, a B25, a Heinkel 111, a Lancaster, all of them still airworthy at the time. There are no barriers at Airshows in the States, you can look into the cockpits of the small aircraft like the Spitfire, Hurricane, Me 109, Zero, Corsair, etc. etc. etc. It was well worth every penny of my trips over there.