The hiccup will reduce their time in South America before next weekend's match against the Pumas, in which the world champions will seek to maintain their unbeaten record in this year's competition.
But Hansen expects a tough contest regardless of travel chaos and insists the squad will not be disrupted by it.
"All I'm interested in is what time is it going to leave and what time do I need be there, then I'll get on the plane. I don't know how to fix them, so there's no point me worrying about it.
"Anybody at home is always tougher than playing them on your own turf. They get excited, their crowd get in behind them, La Plata is a very noisy place when they're performing well, and we're going to have to go there and make sure we take the initiative and take the crowd out of it by silencing them."