Flight 223: Flawed logic alert?

The Washington Post reports that Sunday’s British Airways flight 223 from London to Dulles has been canceled again; the Department for Homeland Security says that cancellations for security reasons are going to be routine activities. The article h…

The Washington Post reports that Sunday’s British Airways flight 223 from London to Dulles has been canceled again; the Department for Homeland Security says that cancellations for security reasons are going to be routine activities.The article has two quotes, though, that sound like BA believes their flights are being cancelled because of false positives: (1) The airline was able to accommodate all of the 184 passengers scheduled for Sunday’s flight to Washington on its two other daily flights from London to Dulles or at later dates. (2) British Airways officials, concerned that the focus on the flight has something to do with its number, are discussing whether to change the number or slightly alter the departure time, an aviation source said.Assume there’s really a terrorist that wants to board that flight. Then that terrorist isn’t a danger on one of the other flights the same day? And that terrorist isn’t a danger when the flight is given a different number, or the departure time is slightly altered?