-- offtopic disclaimer -- (sry RAT5)
if the NY tracon switches JFK to ILS 13L it's really bad for them. LGA goes to 13 operation too and limits volume of EWR/LGA/TEB massively. mostly LGA/TEB i think.
couple of days ago operating JFK13L they switched JFK to 22R single runway ops to get the delays/holding for TEB/LGA/EWR down. JFK ground was not amused and said the tracon calls it "delay balancing"
regarding ILS13R: the curve onto the ils13L is already very tight with other airspace and in avoiding manhattan skyscrapers by a comfortable margin.
at the give distance for joining the ils you can't design the approach above 3000 and even if you could: LGA incoming passes at 4000 and makes a left 270 onto ILS13 there.
i guess you could run an RNP transition onto an ILS for 13R at 1500ft or even just the existing RNP13R if the minimums are above 500 but to get that approved is another story.
also ILS13L is really rare and the 13R glideslope would be even further towards the city.
maybe underfire could tell us how much of a nightmare this would be
