Safe Operating Range
The SOR is the max distance between airfields which the aircraft can fly with full allowance for headwind, diversion, stacking.
• Distance flown in climb included
• Fuel for take-off, climb, landing included
• Allowances made in standardized manner according to type of operation
Gross Still-Air Range
Assumes aircraft starts at cruising altitude
• No allowance made for climb, descent etc
• Important to know how to calculate it