From the Twitter:
"ground halt" on all flights at the following airports: BOS, BWI, DCA, EWR, FLL, JFK, LAS, LAX, LGA, MCO, MIA, PHL, TEB
And just now...
UPDATE: FAA seems to have fixed the computer issues at the affected airports. Ground stops are being lifted.
Last edited by Polikarpov; 30th Apr 2014 at 22:27.