Possible Clues:

• Not on time when trade is slack
• It follows the Super Bowl
• When the mosquitoes fly?
• Switch positions, crossing oceans in slack period for travel
• Not working, as one's abroad when trade is slack?
• Period after a championship
• Leaving before Christmas maybe, when holidays are cheaper?
• Less popular time to be on shore, presumably, with boy
• Not on time, when trade is slack
• Pro's downtime