You must both have passports ( see 1st site below) and letters of permission signed by both parents and notarized. Also, be sure to ask your parents to call the airline and confirm that an 11 yr. old can travel alone with a 15 yr old…or if he needs to be considered an unaccompanied minor and pay the fee and have a flight attendant responsible for him. You must also have a person with proper I.D. waiting at the airport to pick you up. The letter of permission is Mexican law, and, believe me, they check. See site below and read section on minors under “Entry Requirements.”

It’s ALWAYS best to get this kind of info first hand. You don’t want any surprises to ruin your trip! What awesome parents =)

Here’s some info from the US dept of state, and I’ll give you a couple links to help as well. Happy travels!

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ENTRY/EXIT REQUIREMENTS: For the latest entry requirements, contact the Embassy of Mexico web site at or contact the Embassy of Mexico at 1911 Pennsylvania Avenue NW, Washington, DC 20006, telephone (202) 736-1000 or any Mexican consulate in the United States for the most current information.

All Americans traveling by air outside the United States are required to present a passport or other valid travel document to enter or re-enter the United States. This requirement will be extended to sea travel (except closed loop cruises), including ferry service, by the summer of 2009. Until then, U.S. citizens traveling by sea must have government-issued photo identification and a document showing their U.S. citizenship (for example, a birth certificate or certificate of nationalization), or other Western Hemisphere Travel initiative (WHTI) compliant document such as a passport card for entry or re-entry to the U.S. Sea travelers should also check with their cruise line and countries of destination for any foreign entry requirements.

The new U.S. Passport Card is now being issued. The card may not be used to travel by air and is available only to U.S. citizens. Further information is available at and upcoming changes to U.S. passport policy can be found on the Bureau of Consular Affairs web site at. We strongly encourage all American citizen travelers to apply for a U.S. passport well in advance of anticipated travel. American citizens can visit travel.state.gov or call 1-877-4USA-PPT (1-877-487-2778) for information on how to apply for their passports.

Land travelers must have a valid U.S. passport or a U.S. citizenship document accompanied by acceptable photo identification, such as a state or military issued ID. U.S. legal permanent residents in possession of their I-551 Permanent Resident card may board flights to the U.S. from Mexico.

Minors: Mexican law requires that any non-Mexican citizen under the age of 18 departing Mexico must carry notarized written permission from any parent or guardian not traveling with the child to or from Mexico. This permission must include the name of the parent, the name of the child, the name of anyone traveling with the child, and the notarized signature(s) of the absent parent(s). The State Department recommends that the permission should include travel dates, destinations, airlines and a brief summary of the circumstances surrounding the travel. The child must be carrying the original letter – not a facsimile or scanned copy – as well as proof of the parent/child relationship (usually a birth certificate or court document) – and an original custody decree, if applicable. Travelers should contact the Mexican Embassy or closest Mexican Consulate for current information.