Newly released AAN (American Academy of Neurology) guidelines earlier this week to manage sports-related concussions recommend trainers, coaches and physicians to err on the side of caution and remove athletes from play in the setting of a possible traumatic brain injury or concussion.

FORBES: Safety Prevails -- In Updated Guidelines To Manage Concussions

In addition, brain rest is recommended following a concussion, so reading, watching movies and playing video games -- things you might normally do to pass the time on a plane -- may make things worse.

CNN: Is it OK to fly after a head injury?

The suit alleges the league didn't do enough to warn players that they risked permanent brain damage if they played too soon after a concussion and that it hid evidence about the risks for decades.

CNN: NFL wants players' suit over concussions dismissed