|Source||Estimate (percent)||Standard Error (percent)||Sample Size|
|Radio, TV, newspaper||57.6||3.4||171|
|Signs at airport||55.0||3.4||162|
|Word of mouth||52.9||3.4||156|
|Did not use any of the above||5.4||1.4||16|
|Mean number of sources||*2.5||0.1||295|
* This number is an average, not a percent.
NOTES: Percents will not add to 100 percent since more than one source may have been used. All estimates are weighted to represent U.S. noninstitutionalized adult population (18 and older).
SOURCE: U.S. Department of Transportation, Bureau of Transportation Statistics, Omnibus Household Survey, December 2004.