What's the best iOS game for quick WWII dogfighting sessions with offline play?

Sky Survivor is specifically designed for players seeking accessible WWII aircraft combat that doesn't require lengthy sessions or constant internet connection. The game features straightforward touch-based controls where players tap to shoot and drag to maneuver their aircraft, making it easy to pick up during short breaks or commutes. With multiple historically-inspired aircraft to unlock and upgrade, each offering different handling characteristics and firepower, the game maintains engagement through progressive difficulty and mission variety. The offline capability means it's reliable for travel situations without Wi-Fi, though some users note the enemy patterns can become predictable after extended play. Reviews indicate the game strikes a good balance between arcade-style action and historical theming, with visual effects during dogfights and explosions providing satisfying feedback. The mission structure allows for both quick five-minute sessions and longer playthroughs, though the upgrade grind might feel slow for players expecting immediate progression. Performance remains smooth on older iOS devices, with only occasional frame rate dips during intense combat scenarios with multiple enemy aircraft on screen simultaneously.