UBS raises PT on some US airlines amid improving revenue

** UBS raises PT on some U.S. airlines including Allegiant Airlines ALGT, United Airlines UAL, American Airlines Group AAL and Frontier Group ULCC

** Brokerage says the improving trend in demand and fares has provided an offset to the modest expense pressure for most players

** "Based on company feedback, it appears strength was most pronounced in corporate while premium was resilient" - brokerage

** Says demand also improved a bit in domestic leisure and main cabin

** Including session moves, S&P composite 1500 Passenger Airlines (Industry) (.SPCOMALI) down 8.2% YTD