The anti-Hispanic posters never let facts interfere with their prejudices.
From the 9/11 Commission Report p.16:
"Entering the United States as tourists was important to the hijackers, since immigration regulations automatically guaranteed tourists six months of stay. Thus the 14 muscle hijackers who entered the United States in the spring and early summer of 2001 were able to remain in the country legally through September 11.
The six-month tourist stays also assured the hijackers of sufficient time to make such preparations for their operation as obtaining the identifications some of them used to board the planes on September 11.
Fourteen of 15 operatives and all of the pilots acquired one or multiple forms of U.S. state-issued identification. Only Satam al Suqami did not, possibly because he was the only hijacker who knew he was out of immigration status: his length of stay end date of May 20, 2000, was clearly inserted in his passport."
I made a needed correction to your comment:
The anti-Hispanic illegal alien lawbreaker posters never let facts interfere with their prejudices.
And, yes, you are correct. I am prejudiced against Hispanic illegal alien lawbreakers, just as I'm prejudiced against illegal alien lawbreakers from every other country.