Flyers

Flyers...
So every army since Guard have had a model mounted on the flying base
Guard have the Vendetta Gunship
Blood Angels and Grey Knights have the Storm Raven
Dark Eldar have theres
And the Necrons get 2 soon if the current rumors are true.
Only ones missing out where the Sisters of Battle.
Depending on the next Codex
either the Black Templars will show case what the rest of the marine players get as air support, which when you think about it doesn't sound quite right. Why would the Codex for a 2nd Founding Chapter get the shiny new war gear, don't GW like to keep that type of gear to the smurfs book? That line of thinking lends weight to a WD Codex for BT's.
And of course Tau who are getting lots of shiny new play things for the greater good.
Now who is left without air support?
Smurfs, unless their flyer turns up in C:BT
Orks
Eldar
Chaos
'nids
Dark Angels
Sisters of Battle