Quick envelope calculation:
Current global aviation-specific fuel use:
100,000,000 ish barrels/day = 36,500,000,000 bpy
7 barrels of oil per metric ton, so 36,500,000,000 / 7 = 5,214,285,714 metric tons annually, or 5 billion
"In 2016, biofuel production amounted to approximately 82 billion metric tons of oil equivalent worldwide"
I had no idea biofuels had grown so much....
So assuming my maths is ok and disregarding details such as differences in calorific values between dino-fuel ver biofuels, transitioning the global non-rail transport fleets to smaller wheeled to electric, and trucking and aviation to biofuels, could actually work!!