11.   But on most domestic flights, checked luggage is not X-rayed at all.

12.   Carry-on was the only way to go because terra-cotta chips easily and would not have survived a trip in checked luggage.

13.   Checked luggage on domestic flights typically does not receive such scrutiny.

14.   Elsewhere, checked luggage was selected at random and fed into X-ray machines.

15.   Favorite blankets should not be put in checked luggage.

16.   He fit the profile of suspected terrorists because he had a one-way ticket, no checked luggage, a recently issued passport and had paid in cash.

17.   He had no checked luggage, only his carry-on bags.

18.   Identify checked luggage promptly.

19.   In that case, the attackers are believed to have hidden chemical explosive in a cassette player in checked luggage.

20.   In the field, where the machines would be used to scan every piece of checked luggage, the false alarm rate can be far higher.