Teleporting multiple players to multiple destinations

I've spend the last 4 days trying to work this out.

Imaging I wanted to teleport X players to Y destinations. In between each destination there is either a delay of Z seconds or until Player P types a command.

How would I go about that? I thought about running in an asynchronous task but I don't think it is safe to teleport players in a separate thread because your not allowed to access the Bukkit API.

I would appreciate any help on this. Or if it nearly impossible just say so

 

a Synchronous task maybe?
idk a lot could go wrong i havent really worked with them much but you could try a SynchronousDelayedTask.

 

Yeah just start a delayed task? I don't see the problem, just set the delay to as long as you want and then inside it call player.teleport(location);