The ICAO Aerodrome Reference Code.

ICAO has categorised aircraft in two types to establish whether a particular aircraft is able to use a particular aerodrome.

It has two 'elements', the first is a numeric code based on the Reference Field Length for which there are four categories and the second is letter code based on a combination of aircraft wingspan and outer main gear wheel span.

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How to Know Your Plane Part 1

Based on code E, Boeing 777x cannot be accommodated in any airport if the wing tips are not folded....So the folding mechanism allows it use any airport that allows Boeing 777.

Example
Code A - PIPER PA-31/CESSNA 404 Titan

Code B - BOMBARDIER Regional Jet CRJ-200/DE HAVILLAND CANADA DHC-6

Code C - BOEING 737-700/AIRBUS A-320/EMBRAER ERJ 190-100

Code D - B767/AIRBUS A-310

Code E- B777/B787 Series/A330

Code F - BOEING 747-8/AIRBUS A-380-800

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