different between launching vs aerotowing

English

launching

launching (plural launchings)

The act by which something is launched; a launch.
The launching of the Titanic.
- 2010, Raymond Friedman, A History of Jet Propulsion, Including Rockets (page 123)
  By 1940 they had conducted 25 successful launchings of A5 rockets, which reached 10 miles altitude and had a range of 12 miles.

Launch suggests an event at a point in time. Launching suggests a process over time.

aero- +? towing

aerotowing (uncountable)

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