Possible Clues:

• ____ stream
• Part of a fleet fleet
• Plane - glossy black (stone) - stream
• A.F.C. East player
• Set type
• Leave, in slang
• ____Ski
• Air Force One, e.g.
• You might be on one if you do the starts of 20-, 37- and 54-Across
• Word with black or stream