The correct answer is 1) Greater than

The ratio of propellant mass to total vehicle mass for a rocket is typically greater than 0.9 whereas for an aircraft, the ratio of fuel mass to total vehicle mass is around 0.25. The primary difference is that air-breathing engines don't have to carry oxidizer. Rather they harvest it from the air that flows through the engine. For space applications all of the propellant (oxidizer + fuel) must be carried on board the vehicle.

Class performance (2001):