About 10 years ago when US still had a large Mainline operation at LGA there was tall of tearing down Hangars 4 -5 and building a single level Express concourse between the current US gates 1-10 and the A concourse. Once US ops changed making that unneeded the plan Phil D and emshighway described became the latest plan that I had heard.
The two main reasons I heard the Port wanted to do this was to
A) Widen the current CTB concourses, they are very narrow which translates into small (even tiny) holdrooms and limited space for concessions. Take A for example, I can't even imagine how crowded it was when EA had a couple of full L-1011's, A-300's, and 757's going to Florida back in the day. It's pretty bad with just 737's, A-320's, and E-jets of CO,AC, and B6.
B) The other thing they want to accompolish is to have enough space between the concourses to allow two way aircraft movement in the alleyways, as pictured in their drawing, something that is impossible now but would do a lot to reduce current taxiway congestion.
I would be really surprised though if AA would be willing to give up their current and very historic hangars. Some of you might not be aware that when opened in I believe the early 1940's the front offices still visible from the entrance road actually housed AA's Main Corporate or General Office (headquarters) which later moved to mid-town Manhattan until the move to DFW.
Still is an interesting plan, but the airport would be a big construction mess for probably the next 20 years, to match the congestion mess on LGA's taxiways and ramps.
Cheers
LGA777
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