They didn't have to be highlighted. I saw them.
As an interesting tidbit, remember that the three other Arab hijackers aboard Flight 11 drove to Logan, while Atta and Alomari reportedly arrived in Boston the previous Sunday, drove back to Portland and then flew again to Boston.
http://www.worldnetdaily.com/news/article.asp?ARTICLE_ID=24596
BTW, wasn't Bioport, the biomedical firm that the bin Ladens had financial interests in, also located in Boston? I'd look it up myself since I have the old URL, but the thread has been pulled.
The Bioport manufacturing facilities are located in Michigan, but some of the financial backers from The Carlyle Group and Intervac do indeed have ties to the Boston area. *Details here*.