I forgot about that. Mohamed Atta is said to have attempted to visit a prisoner in Tarragona Prison in northeastern Spain, in July, 2001. He also is said to have met with Islamic extremists at the nearby Mediterranean resort town of Salou. This was Atta's last known trip to Europe. I don't know who the prisoner was. I wonder if there's a connection with the Basque separatist movement and/or with Arizmendi?
There is one point of confusion about this trip. The prison visit was said to be on July 21, but his itinerary shows that he returned to the U.S. on July 19, so something doesn't quite jibe here (but it could just be a minor mistake in one of the dates).
Here are some more details on Atta's whereabouts at the time. He was in Las Vegas from June 29 to July 1. I don't know where he was for the next few days, but he might have been in Washington, DC, since there's a reference to him being in Washington sometime in July. On July 7, he flew to Spain, renting a car and driving to Salou in the northeast part of the country, One report suggests that he may also have met with Iraqi intelligence agent Habib Faris Abdullah al-Mamouri in Rome in July. He would have visited the Tarragona Prison towards the end of his trip, then driven (to Madrid?) to catch his July 19(?) flight back to the U.S.