United Airlines (UAL) shares soared 3.3% in the last trading session to close at $107.11. The move was backed by solid volume with far more shares changing hands than in a normal session. This compares to the stock's 8.1% gain over the past four weeks.UAL shares are being aided by strong air-travel demand. The carrier's strong exposure to international markets is a positive, as demand for international flights is robust. The Chicago-based carrier's transatlantic bookings for 2024 winter were 30% higher than ...