Is Apple Pen compatible with iPad Air 2

FYI,

The Apple Pencil will never work with anything but the iPad Pro models until Apple puts the screen technology used in those models into other non-Pro iPad models.

For all other iPad models, you MUST rely on third party alternative styli, like the one I linked to.

No.

Apple Pencil is STILL ONLY compatible with iPad Pro models.

For any other iPad model, the only good stylus I can, honestly, recommend is the Adonit Pixel

http://www.adonit.net/jot/pixel/

Sorry.