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I couldn't find any relevant information about a restaurant named Frontier Airlines. However, I did find information about Frontier Airlines, which is an American low-cost carrier operating scheduled flights throughout the United States, Mexico, Canada, Dominican Republic, Jamaica, Bahamas, Haiti, Costa Rica, Panama, and Guatemala.

If you're looking for information about a restaurant at 42 W 18th St, New York, NY 10011, I couldn't find any relevant details.