Phase 2 of the Airport Transit Study is in progress and will have a pair of Open Houses next week.
Info cards from the Open Houses:
More esoteric options such as monorails, unmanned wheeled rapid transit vehicles etc. are definitively ruled out. Options remaining on the table (page 9 of the above PDF)are:
An APM rail service
Conventional high- or low-floor LRT
BRT bus service
The APM is the currently favored recommended option. Whether the APM or LRT is eventually selected though, service will be independent of the Green and Blue lines, for a number of reasons (page 12 of the above PDF):
Service planning and operations are flexible and scalable to meet demands
Allows for stations to be sized to meet Airport Transit Connection demands. A spur forces the Airport Transit Connection station platforms to accommodate 4-car-trains
The frequency of service is maintained for the communities north of Airport Trail on both Green Line and Blue Line
The frequency of service for the Airport Transit Connection is not limited to mainline service
The system is easy-to-understand as it reduces customer confusion about which train to take at the mainline stations
I have to say I'm disappointed that we won't be able to take a simple spur of the Blue Line right from downtown to the airport, but I do understand their reasons for going in this direction.