One of the directions for creating promising launch vehicles is the creation of aerospace systems in which an aircraft, used as a transport and launch platform is carrying the launch vehicle. Two such systems have already been developed and are in operation, these are Orbital ATK - Northrop Grumman launch vehicle Pegasus and Virgin Orbit launch vehicle LauncherOne. The use of an aircraft as a transport and launch platform provides a number of advantages for such systems in comparison with conventional launch vehicles - from a significantly lower cost of a launch complex to a deduction in the mass of fuel required for a launch vehicle. These benefits will be described in this article. However, the mentioned launch vehicles launched from the platform aircrafts are disposable. The Institute of Aeronautics (AERTI) of the Riga Technical University MSTF is developing the LatLaunch aerospace system for launching small satellites in LEO, the concept of which combines the advantages of an aircraft transport and launch platform and a partially reusable launch vehicle, which will further reduce the cost of delivering payload to Earth orbit. One of the first significant issues in the creation of an aerospace transport system is the choice of a base platform aircraft. To a large extent, this choice is determined by the method of transporting the payload (launch vehicle) that is acceptable for a given aircraft. This article provides a comparative analysis of possible systems for transporting launch vehicles by aircraft, evaluating their advantages and disadvantages, and also ranking them based on an assessment of the possibilities of their use for launching a launch vehicle and transporting it to the launch site. The possibility of further use of the aviation platform in the interests of the mission, after the launch of the launch vehicle, was also assessed. The article can be useful for designers of launch vehicles and aerospace systems for launching payloads into low-earth orbit.