United Airlines expands service that holds planes for connecting flyers to new airports

United is making good on its promise to help more travelers with tough flight connections by expanding its ConnectionSaver tool.

Available through the United Airlines smartphone app, ConnectionSaver sends users personalized text messages with directions to the gate for their connecting flight, information about expected travel time between the two gates and nearby amenities. 

ConnectionSaver debuted at United's busy hubs in Denver (DEN) and Chicago (ORD) in February and and United announced in June it would soon expand the technology to other airports.

As of this week, that list includes Houston's George Bush Intercontinental Airport (IAH). Newark Liberty International Airport (EWR) in New Jersey will be added Tuesday.

United will roll out ConnectionSaver to San Francisco International Airport (SFO) on Aug. 6 and Virginia's Dulles International Airport (IAD) on Aug. 13.

"Following the busy summer period, we’ll share details about our plans to expand the tool to all United line stations," according to an internal United communication to employees.

In June, United Said that in its first four months of service, ConnectionSaver allowed 14,400 customers to make flights they otherwise would have missed. Flights held for them were only delayed an average of six minutes.

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Contributing: Adrienne Jordan