"U.S. border security officials learned of the alleged extremist links of the suspect in the Christmas Day jetliner bombing attempt as he was airborne from Amsterdam to Detroit and had decided to question him when he landed, officials disclosed Wednesday."
But obviously if his plan had succeeded, he wasn't ever going to land. Did it occur to anyone to have the flight crew alerted? Of course not. Equally revealing is the following:
""The public isn't aware how many people are allowed to travel through the U.S., who are linked, who intersect with bad guys or alleged bad guys," a national security official said. "It makes sense from an intelligence perspective. If they are not considered dangerous, it provides intelligence on where they go, who they meet with."
Moreover, the window for identifying a passenger overseas as a potential threat is limited, a senior homeland security official said."
So, again, we wait till they get here to do anything. But what if their plan isn't to get here in the first place? hang on to your seat cushion.