US airports have become a problem for international companies since sept 11th. Having your hub in the US means having plenty of delays, angry customers [who are being threated like criminals... great for CS] and adding $100 to every international ticket [since the US now charges passengers for the privilege of using their wonderful airports]. Ever since several companies have hubbed out of the US, like Iberia and Martinique. Even Air Canada is making direct flights to south america without landing on US soil; which I think is wonderful.
We might not see it in the near future, however, we go closer to this every day. Europe has no borders now, South America is talking about deleting the internal borders of MERCOSUR, in most of Central America, citizens can now move freely between countries, they're only required to show ID. Is the only way to compete against China. Make equally huge markets.