(On the 757s and A310s, I think, they've stopped doing More Room Throughout Coach. Sigh.)
A300s, actually - a much larger aircraft, about the size of a 767.
They put the 757s on the big tourist routes (MCO, LAS, that sort of thing) where they almost never sell premium seats, but sell lots of discount fares. They put the A300s flying to South America, for the same reason. LGA-ORD, however, will almost certainly be on an MD-80, with the extra legroom.
Knowing ORD well, I find the worst-case plane changes for AA (L4 to the far end of G much easier than the worst-case plane change for UA (either end of C to the far end of F. Since Madison is almost certainly not going to be mainline, the chances of having to trek to F are pretty high, if you fly UA.
However, O'Hare is a very compact airport, given the amount of passengers, and the worst case change -- Delta to United, end of L to end of C, isn't that long of a walk.
Personally, I fly AA, but I have status, and they've treated me very well. The extra legroom doesn't hurt. United has it too -- it's called Economy Plus, but you have to have status or fly full-fare to book the E+ seats in advance.
The Gotcha, unless you like frequent flyer miles, is to make sure you're changing on AA in O'Hare, not St. Louis. STL isn't offically a hub anymore, but there are nonstops to both LGA and Madison, which means you could end up turning through STL, and taking a much longer flight on a turboprop. AA doesn't fly turboprops out of ORD anymore (I don't think UA does either), so if you really dislike the eggbeaters, turn through ORD.
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A300s, actually - a much larger aircraft, about the size of a 767.
They put the 757s on the big tourist routes (MCO, LAS, that sort of thing) where they almost never sell premium seats, but sell lots of discount fares. They put the A300s flying to South America, for the same reason. LGA-ORD, however, will almost certainly be on an MD-80, with the extra legroom.
Knowing ORD well, I find the worst-case plane changes for AA (L4 to the far end of G much easier than the worst-case plane change for UA (either end of C to the far end of F. Since Madison is almost certainly not going to be mainline, the chances of having to trek to F are pretty high, if you fly UA.
However, O'Hare is a very compact airport, given the amount of passengers, and the worst case change -- Delta to United, end of L to end of C, isn't that long of a walk.
Personally, I fly AA, but I have status, and they've treated me very well. The extra legroom doesn't hurt. United has it too -- it's called Economy Plus, but you have to have status or fly full-fare to book the E+ seats in advance.
The Gotcha, unless you like frequent flyer miles, is to make sure you're changing on AA in O'Hare, not St. Louis. STL isn't offically a hub anymore, but there are nonstops to both LGA and Madison, which means you could end up turning through STL, and taking a much longer flight on a turboprop. AA doesn't fly turboprops out of ORD anymore (I don't think UA does either), so if you really dislike the eggbeaters, turn through ORD.