(Reuters) -United Airlines shares fell 3% in premarket trading on Thursday, after the U.S. carrier flagged a hit to third-quarter earnings from operational snags at Newark airport. The Newark airport,

The FAA's flight cap, which came in response to rampant delays and cancellations, is working. But what will happen at the end of October, when the cap expires?

United Airlines said Wednesday travel demand has picked up since the beginning of July, thanks to less geopolitical and macroeconomic uncertainty. The Chicago-based airline, however, expects its earnings to suffer in the current quarter due to operational constraints at Newark airport near New York City — one of its largest hubs and among the busiest in the country.