non co2 emissions Rolls-Royce and British Airways test how SAF use can minimise climate impact of contrails News Rolls-Royce and British Airways test how SAF use can minimise climate impact of contrails British Airways November 5, 2025 Google Flights now shows ‘contrail warming’ potential for every flight News Google Flights now shows ‘contrail warming’ potential for every flight Contrails July 10, 2025