Understanding the performance of an aircraft is critical to safe operations. No matter which aircraft is chosen, there will likely be flights where it is pushed to the limit in some form or fashion. Learn what to look for beyond the number of seats, cabin height, published range and cruise speed. A takeoff performance figure may look suitable at first glance; but can be significantly impacted by many variables like the number of passengers, field elevation, temperature, fuel load, engine health, winds and pilot fatigue to name a few.