American Airlines CFO says some travelers have avoided Newark in favor of other area airports, but cautioned the impact was modest.

After weeks of disruptions, an airline exec confirms what frequent flyers already know—travelers are changing course.

Newark Liberty International Airport is one of the largest hubs of United Airlines, and the congested airport is also the Chicago-based carrier's biggest operational challenge. The company told 1.5 million customers in a note on Thursday that congestion at Newark has eased since it reduced flights there.