Delta Air Lines President Glen Hauenstein reported a noticeable trend of travelers visiting Europe during cooler months instead of the traditional peak summer season due to record heat and overcrowding. This shift has been observed over recent years, with consumers preferring to travel in September and October. The trend comes as the summer in the Northern Hemisphere was the hottest on record. Airlines, including United, are responding by extending their trans-Atlantic flight schedules into the fall to meet the demand for travel during more temperate months.