Several planes compete in the supersonic race

Lockheed Martin SR-72

The unmanned American SR-72 spy plane is designed for bombing and scouting. The highly secret project might already have been completed. TOP SPEED: 7,350+ km/h. ENGINE: TBCC engine – a combined turbojet and ramjet/scramjet engine like I-plane's. STATUS: Source claims it to be completed.

CASIC Teng Yun

The Chinese Teng Yun is to lift small spaceplanes to launch at an altitude of 30-40 km. Both planes can land on the ground again unaided. TOP SPEED: Some 7,350 km/h. ENGINE: TRCC engine – a combined rocket and ramjet engine + a rocket-powered spaceplane. STATUS: To be delivered in 2030.

Skylon

A British spaceplane with a long body and short wings with integrated engines. It is to take off, escape the atmosphere, and land unaided. TOP SPEED: Some 6,300 km/h. ENGINE: Sabre engines – a unique combined engine design, 20 years in the making. STATUS: Test flights in 2025.