Update: 13L / 31R has reopened. Due to a runway closure until next winter 2020, when there's a strong NW or SE wind at JFK, major traffic management problems ensue.
Avoid JFK on:
13L / 31R is closed until winter 2020, and historically has handled 1/3 of all arrivals into JFK.
When the wind results in a ~30 knot crosswind or greater on 4L/22R and 4R/22L, JFK is forced to use only a single runway (13R/31L) for all arrivals and departures.
What happens when JFK uses a single runway?
We have a domestic diversion due to the single runway operation at JFK. JBU424's headed to SWF pic.twitter.com/0as13CIGLh— Ethan Klapper (@ethanklapper) April 15, 2019
Due to RWY-TAXI/CONSTRUCTION AND WEATHER/WIND traffic mgmt prgrm causing some arriving flight delays averaging 5 hours and 21 minutes. #JFK— JFK Flight Delays (@FlyFAA_JFK) April 15, 2019