U.S. Customs and Border Protection offers a free app to streamline international arrivals.

Joe Raedle/Getty Images

A time-saving tool for travelers returning to the United States is just a tap away.

After a long international flight, the long lines of passport control and immigration may be disappointing.

A customs sign at the Miami airport

A sign at the Miami International Airport indicates lines for travelers using the Global Entry or Mobile Passport Control services.Credit:Joe Raedle/Getty Images

The smartphone app can bedownloadedfrom Apple’s App Store or the Google Play Store.

That’s not to say you should have Global Entry.

The MPC queue is often closed, even in airports promoting the app.

Plus, sometimes the MPC queue is shorter than Global Entry lines.

Dublin Airport estimates this feature helps travelers save up to two hours of time on their total trip.