BOEING LRX-907 TITAN

This is the LARGEST, MOST EXPENSIVE,HEAVIEST, and produces THE HIGHEST THURST with a top speed of MACH 7.10. (not fully recorded its top speed)
And yes this is a scramjet that uses combined cycle propulsion system or using jet engines and rocket engines at the same time
The higher you go, the faster you get because higher altitude reduces heat friction and drag so here's how to fly it...
1. at launch or runway- activate scramjet engine and controll surfaces. full throttle, lock current heading, pitch up to 30 or above.

1. 5km- activate the booster, and when the solid fuel tank is empty, explode it cuz the detacher on first stage doesn't work. so you have to explode it.

2. 15-20km- Activate the rocket proplusion.

3. almost 30km- activate the rocket proplusion2, the most poweful engine. This requires special skills cuz tbh, idk why it tilt left or right but sometimes up or down itself. So this only need some special skill to fly