In this class action suit against the National Football League in which thousands of retired professional football players allege that defendants failed to take reasonable actions to protect players from the risks associated with concussive and sub-concussive head injuries, petition for permission to appeal the district court's order preliminarily approving a proposed class-action settlement agreement and conditionally certifying the settlement class and subclasses for settlement purposes only is dismissed, where the district court's order was not an "order granting or denying class-action certification" under the plain text of Federal Rule of Civil Procedure 23(f).