With over 300 aircraft models to choose from, CheckMate will most likely have the model(s) you fly regularly and in the future. CheckMate offers 2 sizes of each model single and twin engine aircraft. All data is included on both sizes. It's a pilot's personal preference that matters. CheckMate checklists cover normal procedures and Vspeeds on the front side and the most urgent emergency procedures on the back. Also included on the back is a section displaying needed information for: weight& balance, fuel type& capacity, oil capacity, electrical size, and tire pressure. Trying to locate much of this data in the POH can be very time consuming and let's face it, lots of time isn't always what we have when flying an airplane.