FREDA is a popular checklist used in aviation. It is an acronym that pilots should run through frequently during flight to ensure that the aircraft is set up optimally to maintain a straight and level flight. Note that not everything below applies to Infinite Flight, but can be adapted.
F – Fuel (sufficient for trip?) & Frictions (e.g. flaps, spoilers)
R – Radio (frequencies set, any necessary radio calls made)
E – Engine (check temperature, pressure, etc)
D – Direction Indicator (correct heading & aligned with DR Compass)
A – Altitude (set to correct QNH/QFE)