Yesterday, I booked a ticket with Aerolineas (flying to Trelew - no other airline flies directly otherwise I would have gone with LAN in a heartbeat!) and because it was a domestic flight, I could pay in pesos at the official rate!! Which made it quite affordable even though I'm a foreigner. Like 500 pesos more than the local price (and 450 more than a 20 hour bus riding cama suite to Trelew!)