1.   A better low-tech solution might be to have more efficient curbside baggage service, he said.

2.   Curbside baggage collection, banned after the terrorist attack, now is allowed at most airports.

3.   Curbside baggage check-in was eliminated.

4.   Curbside baggage checks and valet parking, too, were gone.

5.   Measures to be imposed on a permanent basis include banning curbside baggage check-in and allowing only ticketed passengers to go beyond the security screening point.

6.   Southwest Airlines next month will begin testing a system that for the first time will make curbside baggage check-in available to passengers traveling without printed tickets.

7.   Some have reopened curbside baggage check-in, alarming safety specialists like Hudson.

8.   The new rules ban curbside baggage check-in, and knives of any size or material from the passenger cabin.

9.   The Transportation Department also barred curbside baggage checks and permitting anyone meeting passengers from going beyond security checkpoints.