This is admittedly a very strange headline. Why would Allegiant — an airline that not only doesn’t fly to México but also flies no cargo aircraft — get caught in a fight between the US and México over said air cargo? It’s a complex tale, but the short version is this. México is making changes that others don’t like, and the US has had enough. Because of this, Allegiant’s proposed joint venture with Viva Aerobus has been put on hold.