The principle quantum numbers .....or levels K,L,M find expression in 2 major formats:
1) the physics used to build uranium nuclear power plants for electricity
2) the social science life of atoms VIA humans and their activities ..... such as flying by airplane to another city/country for a vacation
OR
the KLM grammar school shootings (KarL Marx and class warfare) of citizens and their educational institution bias ERRORS
Quantum planes ..thus -->
KLM quantum airplanes and
KLM airlines