Related Clues:

• Urgent letters
• ... --- …
• Mariner's 'Mayday!'
• Long-time NASCAR sponsor
• Letters in the sand, perhaps
• Mariner's distress call
• Auto-racing sponsor
• Message from the Titanic
• Help-wanted letters
• Letters in the sand?
• Signal for help
• ''Mayday!''
• USCG alert
• Longtime Richard Petty sponsor
• Sponsor at Indy