U.S. Customs and Border Patrol (CBP) has updated its guide to the electronic Advance Passenger Information System (eAPIS). The original guide was published in 2008. The new one clarifies some ambiguities, such as what to do if weather or other complications prevent an aircraft from landing at the border crossing airport that was originally planned. It also addresses how to proceed if the time window cannot be met. The new guide also addressed departing from an airport that is not designated as an airport of entry by the CBP. Another issue addressed in the new guide is what to do when there are technical problems with the eAPIS system, or some of the required information cannot be input for other reasons. Most of the updates are the result of two years' experience and input from pilots using the system. The CBP also credits the Experimental Aircraft Association for facilitating the exchange of information leading to the updated guide. Representatives from CBP will be available again this year at EAA AirVenture Oshkosh (July 26 to August 1) to answer questions.