UPDATE 4-United Air shares tumble as it vows to match low fares, expand capacity
January 23, 2018 at 18:45 PM EST
NEW YORK, Jan 23 (Reuters) - United Continental Holdings Inc shares fell more than 6 percent in after-hours trading on Tuesday as the airline said it plans to increase capacity, likely threatening its profit margin as it is locked in a price war with low-cost carriers.