If you are interested, Kerbal Space Program has mods for ramjets/scramjets, and the air-breathing rockets are part of the base game now. You can build your own

If you are interested, Kerbal Space Program has mods for ramjets/scramjets, and the air-breathing rockets are part of the base game now. You can build your own Waverider and mess around with all sorts of fun explosions and crashes!