Let's try to describe all the different ways used to start a gas turbine engine. We're including fighter jets, airliners, helicopters and industrial ground running engines.
I will include video examples of as many that I can, and here are some links to other vids:
The Blackbird start cart: https://www.thesr71blackbird.com/Airc...

RR Avons in a Canberra: cartridge fed turbine starter:
   • Cartridge Engine Start  

The F22 startup, featuring a cartridge start of a small starter engine. The video has been edited to cut out the windup of the main engine. I don't know why they did that.
   • This Is What F22 Engine Startup Soun...  

My video on the air turbine starter with a radial inflow turbine:
   • The Air Starter  Turbine Engines: A ...  

My video about air turbine starters with axial flow turbines
   • Air Turbine Starter  axial flow  

My video about the our start cart containing a Garrett GTC 85:
   • the Huffer  Turbine Engines: A Close...  
bonus:    • Northrop YB49 "Flying Wing" (1947 pr...