Jet propulsion utilizing cryogenic fuel

An apparatus warms fuel prior to combustion in a jet engine of an aircraft and supplies cooled bleed air to the aircraft. The apparatus includes a fuel flow path configured to supply fuel to the jet engine for combustion, an air flow path including an inlet air conduit configured to receive external freestream ram air, and an inlet air heat exchanger configured to transfer heat from the inlet air conduit to gaseous state fuel in the fuel flow path prior to supply of the fuel to the jet engine. The inlet air conduit is a first air conduit and the air flow path includes a second air conduit that directs cooled air after the inlet air heat exchanger to the aircraft.