Related Clues:

• Light blue shade
• ''Wild blue yonder''
• "Lucy in the __ with Diamonds"
• Where to see stars
• Blue expanse
• Where to see a vapor trail
• Limitless limit
• Cloud's site
• Diver's milieu?
• The limit, they say
• Kite site
• Telescope target
• Earth's canopy
• Cloud locale
• You might look up to it