We flew to Newark to find out if the airport is recovering from its recent struggles

A traveler walks through Newark Liberty International Airport in early June. United Airlines says Newark was the most reliable airport in the New York City area in June — a remarkable turnaround after a wave of cancellations and delays in April and May.

Record numbers of Americans are expected to fly around the July Fourth holiday, posing a big test for America's fragile air travel system — and for Newark Liberty International Airport in particular.

(Image credit: Spencer Platt)