When an jet is flying, its engines produce thrust. I assume that the thrust and fuel consumption is about the same at all aircraft speeds. However, when the airplane is going faster, it produces more power, because $W=fd$, and more distance is covered in one second. Theoretically, the velocity, and therefore the power, could increase indefinitely. The airplane's force seems to be a 'distanceless' force, while a car has to reference the ground. The car has to increase its power input by a factor of 2 to sustain twice as great a speed, assuming constant air resistance.
This appears to break the first law of thermodynamics, because it seems that you are getting more work done with a constant fuel input. Is there a mechanism by which more power is needed for the airplane at higher speeds, making it fit with the law, or is my reasoning wrong? Sorry if this sounds confusing. Thank you!