1) The campaign will want its official plane to feature the name of the running mate, and someone will see the name being added to the fuselage at the airport.
From an Aviation web site chat board (great sourcing, I know): Kerry’s plane is being painted with decals that say Edwards.
2) The campaign plane will make an unexpected stop, or the campaign will charter a flight from a particular location to a campaign event in a swing state.
Another rumor has a chartered plane from Alaska landing a while ago near Dayton, Ohio. If true, that could mean McCain’s selection could be an outside-the-box game-changer: picking Alaska’s first female governor, Sarah Palin, a 44-year-old mother of five and political maverick in her own right, who went against her state’s GOP establishment in recent years to drive a series of reforms through.