It is backwards compatible; deprecated authority codes will not be used to represent another country or territory. The two-letter ISG code is based on ISO 3166-1 alpha-2, except for Greece, for which the code “EL” should be used and for the United Kingdom for which the code “UK” is used in the context of the EU institutions.
Two-letter IATA codes. In addition to the three-letter code, IATA codes of two characters exist. These "two-letter codes" are used to indicate airlines. The "two-letter code" can consist of two letters or a number and a letter. You may have encountered these codes on flight tickets or on departure and arrival signs at airports. Three-letter
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eu countries 2 letter codes
