Staff shortages and equipment failures at Newark Liberty International Airport have raised safety concerns in recent weeks.

Travel woes at Newark Airport continued Monday after a weekend featuring another radar outage, a ground stop and dozens of flight cancellations and delays. The FAA announced Newark was operating on a ground delay program,

Delays and cancellations at Newark Airport have raised questions about whether a shortage of air traffic controllers and technological issues could fuel travel disruptions elsewhere.

Because of the way airline networks are structured – particularly at United Airlines, which runs a major hub at Newark – delays and cancellations at that airport can have knock-on effects on flights scheduled to use the same planes later in the day on other routes.

CHICAGO (Reuters) -United Airlines is facing a financial hit and potential long-term reputational harm as flight delays and cancellations pile up due to ongoing disruptions at Newark airport - one of its largest hubs and among the busiest in the country.

With airports and airlines experiencing delays and cancellations, and staffing shortfalls at national parks, here’s what to know before you go.

The FAA plans to limit landings and takeoffs to 28 each per hour. Before the April outage, the number often exceeded 40 landings an hour and 40 takeoffs. The FAA says that limit will remain in place until June 15, when runway construction is finished. That number will increase to 34 landings an hour through October 25.

Newsday spoke to experts who said that the direct cause of Newark’s blackout was unique, but the region's other airports like Long Island MacArthur, LaGuardia and John F. Kennedy face some of the same underlying issues — like dated equipment and a long-term shortage of air traffic controllers.