A new way to launch things into space is by using air-rocket systems instead of traditional rockets from the ground. This method involves launching a space rocket from an aircraft at a certain height above Earth. It can help launch small satellites while saving money and reducing the need for ground infrastructure. The researchers looked into designing rockets for this system and calculated that a two- or three-stage rocket could lift a 10 kg payload into orbit at 500 km above Earth. This approach could be useful for countries without their own spaceports.