Sid Meier’s Ace Patrol is now live on Steam with a 10% discount for £5.39 until the 4th September. Battle to Rule the Skies. The skies over Europe are a dangerous place, where ace pilots lead their squadrons to glorious victory or crushing defeat. Take control of dozens of the most famous fighter planes of WWI and head into the dogfight. Roll, slip, and loop to get the drop on enemy aces.