United Airlines Holdings Inc UAL.O gained after the carrier lifted its current-quarter revenue forecast, boosting shares of Delta Air DAL.N, American Airlines AAL.O and Spirit Airlines SAVE.N. Investors were cheered by data showing U.S. retail sales increased 0.9% in April as consumers bought motor vehicles amid an improvement in supply and frequented restaurants. The U.S. Federal Reserve will "keep pushing" to tighten U.S. monetary policy until it is clear inflation is declining, Fed Chair Jerome Powell said at an event on Tuesday.