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According to Boeing, the purchase is for two MILLION gallons SAF for its commercial operations, NOT two billion.
Note - on a typical 2-hour flight, a Boeing 737-800 would consume 833 gallons per hour, or 1666 gallons for the 2-hour flight.
There might be 4 such test / ferry flights for a shiny new Boeing 737.
Lets stipulate the plane undergoes four 2-hour flights, requiring 6664 gallons for a 737 test and ferry program
Dividing 2 million gallons by 6664 gallons for each aircraft results in the number 300 aircraft.
Meaning that about 300 narrow-body aircraft could be test-flown using the contracted volume of SAF.