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I don't believe it does, at least not in a typical configuration.

The only true double-deckers are the 747 and the A380. Some other wide-bodies have been configured with a galley below the passenger deck, so flight crew have stairs but not passengers.

Maybe there's a variant with lavatories below deck? If so, it's not common.

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The A340 in a few airlines (Lufthansa for sure, others probably too) has a set of lavatories below deck. So other than the 747 and A380 that’s the only other plane I can think of with stairs for passengers.

I flew on the Lufthansa A340 from MUC to SFO and very much liked their lavatory setup. Having 6 lavatories in one spot solved very much the logistics of selecting the right one and reduced the waiting time. Also, it is nice not to sit besides the constantly closing doors.

What’s interesting is the extra security measures: lots of handles to hold onto and oxygen masks for the pax down there waiting for the toilets.

Ah correct, that's the one for the crew, not passengers. My bad.

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