Journey - Don’t Stop Believing
Europe - The Final Countdown
ABBA - Gimme! Gimme! Gimme! :o
Soul Sacrifice, by Santana. Gregg Rollie did some great Hammond organ work on the early Santana albums, and his solo on Soul Sacrifice is ideal for air keyboards.
Rhapsody in Blue
Almost anything by Styx.
“Taking Care of Business” - BTO
Rush makes me play air bass, does that count? 
Toto - Roseanna
That’s Just the Way It Is - Bruce Hornsby
End of the Innocence - Don Henley
Small Town - John Cougar Mellencamp
All My Love - Led Zeppelin
The Beatles - Martha My Dear, Oh! Darling, You Never Give Me Your Money
Early Depeche Mode - stuff like Dreaming of Me, Somebody, Just Can’t Get Enough.
Sisters of Mercy - 1959
Joe Jackson - Stepping Out
Deacon Blue - Dignity
All the LvB piano sonatas that I like.
Wizards in Winter - Trans-Siberian Orchestra
Man, I’m a piano/keyboard player, and I don’t think a song has ever inspired me to “air keyboard.” I thought it simply wasn’t done. Apparently not.
I know Genesis has been mentioned, but The Lamb Lies Down on Broadway and Cinema Show have made people’s fingers move… never mine, of course… (clears throat)
“All The Way From Memphis” by Mott the Hoople–how can you not?
“Linus and Lucy”/Vince Guaraldi
“Fine, Fine Day”/ Tony Carey
“Angie”/Rolling Stones
House of the Rising Sun - The Animals
NPR’s Fresh Air theme song
Zombie Nation - KernKraft 400
A couple of passages of Bach organ pieces make me want to play the floor pedalboard. 
Nobody’s mentioned Jon Lord yet?
How can you NOT play air Hammond organ when you hear “Highway Star”? (Or “Hush” or “Burn” or…)?
Moonlight Sonata
Live and Let Die
Whiter Shade of Pale
several Madness songs, including “Disappear,” “It Must Be Love,” and “Shut Up”