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Originally Posted by BBMW
I don't know why they aren't looking at major air side changes. This would make things much more efficient both at LGA and JFK.
They should get rid of the 4-22 runway, and add another 13-31. This way they can use both runways at full capacity simultaneously. Also the runway 4 approach can interfere with the use of the 13 runways a JFK.
Getting rid of 4-22 would also free up a lot of land at it's 22 end (near the Grand Central Parkway.) This would be a good place to move the terminal complex. Demoing the old terminals would free up the land to build the new 13-31 runway (what would be 13L-31R.) They should also add some landfill or build platforms to extend the runways a few thousand feet. As they are they're too short.
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It's an interesting proposal, however short of the existing runway 13-31, you're pretty much razing and rebuilding the entire LaGuardia Airport which would cost a fortune and just isn't feasible.
Going with your idea though, you could move the Marine Air Terminal into the corner currently occupied by Delta, and build a sort of checkmark shaped set of terminals with parking structure filling in the current end of runway 4-22.
Like you said, you could easily extend both the existing 13-31 and new 13-31 to accommodate larger aircraft.
It would be interesting trying to squeeze in parallel approaches though considering the current approach to 31 is already very tight to appease NIMBYs.