[dnautics]

the article specifically mentions 747s. 777s and 787s are regularly commuting trans-pacific these days; and have two- or three- tiered class seating; Presumably A340s and A380s, fit the bill as well.

I think long-haul flights more or less refer to flights that take longer than the ~11 hour flight crew shift.

Edit: apparently a long haul flight is any flight > 6h