Also, the Phoenix aircraft must refual a couple of times, in foreign countries, to get to the US.  The aircraft might be denied landing rights if an Ebola patient isn't in a POD, even if no one leaves the aircraft. 
I am a bit of an aviation buff and previously read up on the   
Phoenix Air ambulances  They are using modified   
Gulfstream G-III jets to airlift Ebola patients back to the USA. The jet is refueled at 
Lajes Air Field  on the Azore Islands before flying to the USA.  
Inside the Flying Quarantine Ward Used to Transport Ebola Patients     Phoenix Air details Ebola flight operations in 'Flying ICU'
_________________________
Earth and sky, woods and fields, lakes and rivers, the mountain and the sea, are excellent schoolmasters, and teach some of us more than we can ever learn from books. 
John Lubbock