Thousands of flights were delayed or canceled Monday. This happened across the US Northeast.

A main communication line failed at an FAA facility in Philadelphia. A backup Verizon fiber-optic cable was also cut.

Construction workers cut the cable in New Jersey. This happened between Newark and New Brunswick.

The failures disrupted flights into Newark, New York and Philadelphia. Five Northeast airports were affected.

Newark Liberty International Airport had no arrivals for hours. Arrivals stopped from about 9:40am to 5:20pm.

Philadelphia and LaGuardia airports resumed operations earlier. Travelers were told to check their flight status.

The cut cable was later repaired. The US transportation secretary said airports were resuming normal operations. Airport operations across the Northeast resumed Monday evening.