It could be the use of a feint! Michael thought that Clement's sudden exposure of his 'whereabouts' must have been to falsely lead his enemies.
It would be difficult for Michael to find him if he'd been in any other place. Therefore, Clement must come to Lake City. Lake City was Michael's territory, and Clement would easily be caught and intercepted by Michael's men if he came here.
Then, Clement had put out false information, making Michael think he would be on the flight at 3:20 p.m. In this way, Michael would assign most of his informers and men to this flight. Clement could then take the opportunity to leave the airport without a hitch at another time.
Moreover, Clement must have already arrived. Since Michael would have had many men assigned to the airport, they would have guarded well against Clement's escape or any disturbances. The greatest likelihood was that Clement had arrived this morning.
