Aviation Flight Time Calculator helps you to calculate easily your Flight Times in the "HH: MM" - Format. You can add and subtract times. If you have question please send me a mail to: stevedexter58@gmail. com. Please remind I can not answer to your question on the rating board. e. g: 1: 23. 2: 34. 0: 23. 4: 20. Aviation, FlightTime, Flight Time, Calculator.