Originally Posted by
80ktsClamp
330-900s will be included in the 330 category.
The 350 is different enough that the FAA required landings in both the 330 and 350 for currency, which is too onerous to justify a combined category. UA and AA keep the 777 and 787 separate as well for similar reasons.
It's not just TO/landing currency, they require separate segment currency i.e. for all 8 phases, which is not practical for Delta.
Also, A330 and A350 are separate type ratings as printed on a pilot certificate in the FAA world, unlike "757/767".