Yeah we don't have any dedicated IROs here at Delta. Usually we talk about who needs landings during briefing and the Captain divvies it up....or we flip a coin, whatever. Its normally not a problem to get your landings in.

But we do have a mini-1-day-recurrent every 6 months to practice some stuff in the sim. Generally a non-jeopardy painless event.

Now the 777 is probably tougher with 4 pilots. I think there are probably a bunch of guys who only land in the sim.