2. YYC is the airport code for:

Calgary, Alberta, Canada
Banff, Alberta, Canada
London, Ontario, Canada
Toronto, Ontario, Canada

3. MXP is the airport code for:

Milan, Italy
Madison, WI
Milwaukee, WI
Mexico City, Mexico

4. MDW is the airport code for:

Chicago, IL
Mexico City, Mexico
Montgomery, AL
Memphis, TN

5. CVG is the airport code for:

Vancouver, British Columbia, Canada
Cincinnati, OH
Corpus Christi, TX
Cleveland, OH

6. BGM is the airport code for:

Bangor, ME
Binghampton, NY
Milan, Italy
Billings, MT

7. CAE is the airport code for:

Columbia, SC
Columbia, GA
Columbus, OH
Cincinnati, OH

8. ART is the airport code for:

Anchorage, AK
Asheville, NC
Watertown, NY
Wilkes-Barre/Scranton, PA

9. ZRH is the airport code for:

Rome, Italy
Paris, France
Zurich, Switzerland
Stockholm, Sweden

10. BOG is the airport code for:

Boston, MA
Nashville, TN
Brunswick, GA
Bogota, Columbia