The trick: Your indicated airspeed reads slow at altitude. True airspeed = IAS + 2% per 1000 ft.

• Altitude (in thousands of feet) × 2 = % bump
• TAS = IAS + (IAS × bump%)

Worked example: 280 KIAS at FL350 → 35 × 2 = 70% · 280 × 70% = 196 · TAS = 476 KTAS.

How to play. Each round is 12 questions. Start in CADET mode — just turn the altitude into a percentage bump. Once that's automatic, move to PILOT for the full TAS calculation at light-aircraft altitudes. When the trick is second nature, try TOWER — jet altitudes (FL200+), against the clock with a bonus for the high stuff. Beat the top 10 and you'll be invited to add your callsign to the leaderboard.