Aviation English is an unformal aviation language. No nation speaks it - all pilots understand it
Aviation English consists of all of the following:
complex of standardized messages (standard phraseology)
abbreviations,
special three-letter codes abbreviation
coded messages (for METAR, TAF, NOTAM, etc)
technical English - e.g. related to the aircraft parts, technologies, systems, etc
plain text spoken in pre-determined order
and many more