I have a question about my upcoming visit to Patagonia (Feb/2013). At the end of my itinerary, I plan to fly from Ushuaia to Buenos Aires (EZE, international airport), 1:45 pm to 5:13 pm. I will then connect to a flight at 9 pm back to US. I have heard that flights from the Patagonia region are not very reliable at times. So based on your experience, is 4 hrs layover sufficient? How likely it is to miss the 9pm connecting flight?