I'm wondering for quite a while what does the (X) in 330, 340 names means?
ie: Birdy Airlines has 3 A330-301 (330 serie 300 with GE engines): OO-SFM, -SFN, -SFO.
But what does the X means in A330-300 (X)??
HL7553 A330-323 from Korean Air is a 330 serie 300 with PW engines and the X??
By the way does anyone know where to find a list where you can find detailed explanation of the last digit of Airbus names? (ie: the "1" in A330-301)?
thanks you by advance!