Qantas Airways uses the airline code QF.
EVA - a Taiwanese airline uses the Airline IATA Code of BR.
Klm
American airlines
UV is for Universal Airways.
The ticker symbol for the Airline Index is XAL
Delta Airline
Qatar Foundation
Jet2.com has the IATA airline designator code LS
KLM
Easy jet
American Airlines uses TS due to the engine size.
A Navy Flight Surgeon uses this very insignia. Airline, I do not know.