Steelrat,

Just don't plan on being at the top of your game while flying at altitude. Commercial aircraft are pressurized to maintain a cabin pressure of 8,000 feet. At this altitude, the brain will be receiving less oxygen. Research shows that cognitive abilities will be diminished for those with a history of concussion. Returning to a lower altitude will cause a slow return of cognitive abilities to the post concussion state. For me, I am usually back to normal the day after the flight if I get good sleep that night.