I actually think this wouldn’t be that hard, given what details we know.
For instance, going solely by my memory, I should be able to call the FBI field offices in Portland, ME, Boston, NYC, and Washington, DC, and the office of the Solicitor General and say something to this effect:
"Please record this conversation. It is urgent.
Early tomorrow morning, a man named Mohammed Atta and 18 accomplices will attempt to hijack four planes in the United States for the express purpose of crashing them into national landmarks, including the World Trade Center, the Pentagon, and the Capitol.
Mr. Atta will return a rental car to Enterprise at the Portland, ME airport either this evening or very early tomorrow morning. In this car, in his belongings, you will find an instruction manual and religious justification for hijacking, written in Arabic.
Mr. Atta will travel from Portland, ME to Boston Logan on a commercial flight very early tomorrow, possibly around 6am. He will have one companion, possibly as many as four on this flight. He will transfer from this flight to a flight at Boston Logan (possibly American Flt 11, though I am unsure). He, and four accomplices, will attempt to hijack this plane and crash it into the World Trade Center. This plane is bound for Los Angeles.
Going through security, he and his accomplices, will be carrying box cutters. They will use these box to subdue the crew, and intimidate the passengers, and take over the aircraft.
Simultaneously, three other hijackings will be attempted by the other 14 terrorists.
These flights are a United 757 leaving Logan approximately the same time as American Flt 11 (8.00am?) for which I do not know the flight number. The plane is carrying a light load. I believe around 40 persons, passenger and crew. It is destined for Los Angeles.
Additionally, United Flt 93 will be the subject of an attempted hijacking.
Lastly, another flight, of which I don’t know the number is threatened. This last flight will be carrying Barbara Olson, the CNN reporter, and wife of Theodore Olson, US Solicitor General. Contact her for the flight number. It departs from Dulles or Reagan Natl.
All 19 terrorists are members of Al-Queda. 15 are Saudi nationals, though some may be traveling on false Yemeni passports. 4 of them have attended commercial flight schools in the US to learn how to fly 7x7 series Boeing jets. One accomplice is named Marwan Al-Shehi. Some have lived in Florida (possibly Vero Beach).
Mr. Atta previously lived in Hamburg, Germany, and is associated with a radical Islamic mosque there. The German police may have further information.
Here are further details you may need to know.
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There is a man currently in Federal custody for immigration violations, named Zacarias Moussaiou. He can corroborate this information. However, he is an Al-Queda terrorist, so full corroboration will take time.
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All flights, with the exception of United Flt 93 will have 5 terrorists on board. United Flt 93 will have 4 terrorists.
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If required, I can provided names of 1 other passenger on Flt 93, but not on the other flights.
This is all the information I know. Please corroborate as much as possible immediately, and take immediate action.
I will alert the media in New York City, Boston, and Washington DC at 10:15 EST this evening, allowing them to put this information on the air on the 11pm News.
You may forestall this alert by putting out an AP bulletin saying that the FBI has “credible evidence of a future action by foreign agents against US interests.” by 8pm EST. You need specify nothing further.
This is a serious threat to our nation. I can provide no further information. God Speed."
There is no question in my mind that an FBI agent would follow this lead up the chain of command pretty quickly, and since there are a number of easily-corroborated facts, I think credibility would be good.
Wish it were that easy, though.