These come to us via the Robot of Ask Mr. Robot fame.
#show Swift Flight Form
/cast [modifier:ctrl] Running Wild; [modifier:alt] Sandstone Drake; [swimming] Aquatic Form; [combat] Travel Form; [flyable,nocombat] Swift Flight Form; Travel Form
What it does courtesy of Macroexplain.com
If you were holding the control key then:
Cast Running Wild on the currently targeted unit
Else, if you were holding the alt key then:
Cast Sandstone Drake on the currently targeted unit
Else, if you are swimming then:
Cast Aquatic Form on the currently targeted unit
Else, if you are in combat then:
Cast Travel Form on the currently targeted unit
Else, if you are in a zone allowing flying and are not in combat then:
Cast Swift Flight Form on the currently targeted unit
Otherwise:
Cast Travel Form on the currently targeted unit
/cast [modifier:ctrl] Swift White Ram; [flyable] Red Proto-Drake; Swift White Ram
What it does courtesy of Macroexplain.com
If you were holding the control key then:
Cast Swift White Ram on the currently targeted unit
Else, if you are in a zone allowing flying then:
Cast Red Proto-Drake on the currently targeted unit
Otherwise:
Cast Swift White Ram on the currently targeted unit