At least seven inbound aircraft have already diverted:
UA337: AUS-EWR diverting to MDT
UA374: CLE-EWR diverting to PIT
UA1164: FLL-EWR diverting to IAD
UA1213: RSW-EWR diverting to PHL
UA1657: IAH-EWR diverting to ABE
UA1994: PBI-EWR diverting to ABE
UA2033: TPA-EWR diverting to IAD