Possible Clues:

• Aetna alternative
• Insurance company with a longtime Peanuts-based ad campaign
• Prudential competitor
• Company whose ads have 'Peanuts' characters
• ___ Building (N.Y.C. landmark designed by Emery Roth and Sons)
• Bio of a baseball player?
• Owner of the airships Snoopy One and Snoopy Two
• Insurance company with Snoopy on its blimp
• Snoopy's insurer?
• Hartford competitor