One person flying AA LHR - USA today (Dec 26) said, roughly, "Cabin lockdown mode was started at 1 hour out: TSA does not want any passengers lap to be covered. Pillows and blankets must be removed and stowed. No personal items are allowed (out). No tray tables down and lavs are locked off. All electronic devices must be turned off and stowed. No one may get out of their seat. IFE is turned off as are the Power Ports. Another TSA Directive regarding the IFE system requires shutdown."

Pretty sterile, and we'll see what happens in the next few days (once the TSA managers come back to work, maybe after New Year's Day?)