If your application is using these entities only in the context of journeys, perhaps point of embarkation or point of origin may work.
Quoting http://www.travel-industry-dictionary.com/point-of-embarkation.html
point of embarkation, point of origin. Where a journey begins.
EDIT: update after comment ...
http://www.thefreedictionary.com/disembarkation
has an example
The company's 2003 revised Cruise Atlas, due out shortly, contains a listing of over two hundred approved embarkation and disembarkation ports, daily rates, plus complete terms and conditions of the program.
So, I guess one could say stations or airports are embarkation/disembarkation points.