Related Clues:

• Fifty-one, almost in one dimension
• Nothing back to get soundly in line
• Close to fifty-one all in line
• At length it's in line with being fifty-one - almost that
• In line to be in a playful king
• Fifty-one close in line
• Sounds obvious that'll make things smooth in the air
• Fifty-one, almost, on the line
• At length it's not far at last to have nothing up your lug
• That'll make it smooth for air travel
• Nothing back with sound in there in one dimension
• Close to fifty-one gets lined up here
• Nothing up with your hearing though you're fifty-one, almost
• Less than three-dimensional
• Cabin setting