Are the PostBus and the Blatten-Belalp cable car included in the Aletsch Explorer Pass?

No, the Aletsch Explorer Pass does not entitle you to travel by PostBus or ride the Blatten-Belalp cable car. The Aletsch Explorer includes the sports and feeder lifts of the Aletsch Arena, as well as the train from Fürgangen to Brig.