RoMax wrote:And why not the MH one, there may be dozens of reasons for that...
You're right, I was too quick to reply. Engine type seems to be one of those reasons. Therefore I compiled a short list based on planespotters.net, showing SN has the following A330's:
OO-SFM, SFN & SFO: A330-301 - GE engines, 19 years old
OO-SFV & SFW: A330-322 - P&W engines, 18 years old
OO-SFY & SFZ: A330-223 - P&W engines, 14 years old
So already 2 different engine types. And LH and LX have A333's with neither of them, theirs are powered by RR Trent. Same engine manufacturer for LH's A346's and A380's. Their A343's are CFM powered.
Also, the MH bird may be younger, but perhaps it performed regional routes. In that case it might have done more cycles than the LX one, if that was really used for long-haul.