1.   Boeing said that airlines should also install a flame arrester on the inlet pipe of a fuel pump inside the tank.

2.   Airlines could install handguns in locked boxes in cockpits accessible only to trained crew members.

3.   All airlines are installing them to prevent anyone from entering during flight.

4.   Airlines are installing new cockpit door locks to at least slow down any attempt to reach the flight deck.

5.   But the final humiliation came when OSHA suggested the airline temporarily install nets to catch luggage flying off the baggage system.

6.   Eventually, lawyers say, if enough airlines install improved equipment it creates a higher standard for the industry.

7.   Most major airlines had installed temporary deadbolts, crossbars and locking devices on cockpit doors within several weeks of the attacks.

8.   Moreover, the FAA should make sure that airlines install only parts that come from manufacturers with government approval, said Ed Glueckler, association president.

9.   No one appears to doubt that airlines have installed narrower seats and added more rows so they can wring a few more dollars of profit out of each flight.

10.   The inspector general found that some airlines had installed the system but were ignoring it.