Yep.
"Freeway Airport evaluated suspected hijacker Hani Hanjour when he attempted to rent a plane.
He took three flights with the instructors in the second week of August, but flew so poorly he was rejected for the rental, said Marcel Bernard, chief flight instructor at Freeway."
http://www.newsline.umd.edu/justice/specialreports/stateofemergency/airportlosses091901.htm
"Marcel Bernard, the airport manager and chief flight instructor, told FBI agents investigating last week's suicide attacks that one of their suspects in case, Hani Hanjour, had flown with flight instructors on three occasions over the last six weeks…
His flying skills were so poor overall that [instructors] declined to rent a plane to him without future training,’ Bernard said of Hanjour."
http://web.archive.org/web/20030908034933/http://www.gazette.net/200138/greenbelt/news/72196-1.html
"Mr. Hanjour, who investigators contend piloted the airliner that crashed into the Pentagon, was reported to the aviation agency in February 2001 after instructors at
his flight school in Phoenix had found his piloting skills so shoddy and his grasp of English so inadequate that they questioned whether his pilot's license was genuine."
"Ms. Ladner… feared that his skills were so weak that he could pose a safety hazard if he flew a commercial airliner."
"A former employee of the school said that the staff initially made good-faith efforts to help Mr. Hanjour and that he received individual instruction for a few days. But he was a poor student.
On one written problem that usually takes 20 minutes to complete, Mr. Hanjour took three hours, the former employee said, and he answered incorrectly."
"Staff members characterized Mr. Hanjour as polite, meek and very quiet. But most of all, the former employee said, they considered him a very bad pilot…
'I'm still to this day amazed that he could have flown into the Pentagon,'' the former employee said. ''He could not fly at all."
http://query.nytimes.com/gst/fullpage.html?res=9D00E0DC1E31F937A35756C0A9649C8B63
"[Managers] reported him not because they feared he was a terrorist, but because his English and flying skills were so bad, they told the Associated Press, they didn't think he should keep his pilot's license…
‘I couldn't believe he had a commercial license of any kind with the skills that he had,’ said Peggy Chevrette, the manager for the now-defunct JetTech flight school in Phoenix."
http://www.cbsnews.com/stories/2002/05/10/attack/main508656.shtml