International Attendee Resources

International Travelers

The AAS provides this travel information as a courtesy to meeting attendees.  It is the responsibility of each attendee to ensure that she/he/they has/have the necessary documents, including those for entry into another country or re-entry into his/her/their own country.  It is recommended that you check with your institution’s travel department for specific guidance in these matters.

Please refer to the Center for Disease Control official website for DETAILS ON AIR TRAVEL TO THE U.S.


Visa Requirements

All international visitors to the United States must have a valid passport; some attendees may need a visitor visa.  Please consult the embassy or consulate in your country well in advance of travel to ensure that the appropriate documentation is obtained.  We encourage all attendees planning to attend the AAS Annual Conference and in need of a Visa to apply as early as possible (At least 6 months in advance is recommended) and to pay careful attention to U.S. State Department guidance in this matter as some requirements may have changed since you last traveled to the U.S.

Please be advised that the AAS does not influence government decisions related to Visa applications.  We can neither advise you on what steps you should take nor speak to anyone on your behalf.  The links below are included for your reference, but it is your responsibility to follow all steps and instructions as they are printed and in a timely manner.  The only assistance the AAS can provide is a personalized letter of invitation to be included with your Visa Application.  See the information listed below.

U.S. Visa home page  (Travel.state.gov)

Visitor Visa Information

Visa Waiver Program

U.S. Embassy/Consulate List


Letter of Invitation

If you need a visa to visit the United States, you will also need to carry a letter of invitation. 

Letters of invitation are provided to the following individuals only:

(1) Individuals registered to attend the 2025 Annual Conference

  • If you ARE NOT presenting on a panel, please CLICK HERE to request a letter of invitation

(2) Individuals accepted to present on a formal panel session

We will not provide a letter of invitation unless you meet one of the criteria listed above.