"Several times a month it also happens that Cathay or Thai use the 744."
Thai: it happened during winter season 98/99, where about half of the flights were scheduled on B744, but they changed back to MD-11 only (technical reasons may need a B744)
Cathay: CX changed to A343 som 2 or 3 years ago. Since then, there wasn't normal scheduled flight on anything else to ZRH. The last CX B744 was seen in ZRH some weeks ago, after a CX A343 had to stay at ZRH after engine problems. So the B744 coming of AMS made a stop at ZRH on its way to HKG.
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