Star Alliance member United Airlines is gearing up for its busiest Memorial Day weekend in the carrier’s history, with an astounding three million passengers expected onboard. This represents a 5% increase compared to last year. Each day between May 23 and 28, more than half a million travelers will check-in, head to the airport, and then take a flight with the Chicago-based carrier. This number of passengers represents up to three takeoffs every minute, reaching 4,400 flights daily over the holiday period.