From 01/04/1956 to 26/03/1957

Before	Group or Squadron	Flight number	Tradition name	Geographic place	Equipment	After
	EC 1/20 Aurès Nementcha	1	1/20(1)	Oran	P 47 Thunderbolt
		2	1/20(2)
	EC 2/20 Ouarsenis	1	2/20(1)	Oran	P 47 Thunderbolt
		2	2/20(2)

The 20th EC is created while succeeding the EEOC 1/17 and various elements (IM n°5493/EMAA/1.0 du 10 March 1956)

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20th EC

From 26/03/1957 to 25/07/1960

Before	Group or Squadron	Flight number	Tradition name	Geographic place	Equipment	After
	EC 1/20 Aurès Nementcha	1	1/20(1)	Oran	P 47 Thunderbolt (2)
		2	1/20(2)
	EC 2/20 Ouarsenis	1	ERC 3/561	Oran (1)	P 47 Thunderbolt (2)
		2	ERC 4/561

(1)
Boufarik	27/11/1957

(2)
Mistral SE 535	from xx/09/1957

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20th EC

From 25/07/1960 to 01/02/1962

Before	Group or Squadron	Flight number	Tradition name	Geographic place	Equipment	After
	EC 1/20 Aurès Nementcha	1	1/20(1)	Boufarik	Mistral SE 535 (1)
		2	1/20(2)
	EC 2/20 Ouarsenis	1	ERC 3/561	Boufarik	Mistral SE 535 (1)
		2	ERC 4/561
	EC 3/20 Oranie	1	SPA 96	Boufarik	Mistral SE 535 (1)
		2	SPA 12

(1)
AD 4 Skyraider	from xx/04/1960

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20th EC

From 01/02/1962 to 14/11/1963

Before	Group or Squadron	Flight number	Tradition name	Geographic place	Equipment	After
	EC 1/20 Aurès Nementcha	1	1/20(1)	Oran	AD 4 Skyraider
		2	1/20(2)
	EC 2/20 Ouarsenis	1	ERC 3/561	Oran	AD 4 Skyraider
		2	ERC 4/561
	EC 3/20 Oranie	2	SPA 12	Oran	AD 4 Skyraider

EC 1/20 Aurès Nementcha : winding up the 30/09/1963

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20th EC

From 14/11/1963 to 01/02/1964

Before	Group or Squadron	Flight number	Tradition name	Geographic place	Equipment	After
	EC 3/20 Oranie	2	SPA 12	Oran	AD 4 Skyraider