For much of the second act she seemed to float and fly, as if the air was her natural element.

ECONOMIST: Obituary

"This is the third significant military campaign, after Desert Storm and Kosovo, in which air power has been the decisive element and where casualties have been negligible, " John Pike, the chief analyst at the online security newsletter GlobalSecurity.com, said.

CENTERFORSECURITYPOLICY: Center For Security Policy

The lightning American advance on Baghdad, beginning before the air-war proper, recovered an element of surprise that the large and ponderous deployment seemed to have forfeited.

ECONOMIST: Assessing the campaign: The reckoning | The

Trees and plants also play an important role to help induce airflow and provide shade on hotter days in courtyards, and water is a common element because it can help cool the air through evaporation and can have a calming effect on the space.

WSJ: Full Enclosure - WSJ Mansion

Current and former marshals contacted by CNN took exception to Napolitano's claims, saying that although there is an element of randomness to increase unpredictability, the assignments of air marshals are largely based on intelligence and an analysis of which flights are most vulnerable or most attractive to terrorists.

CNN: Air travel security under review, officials say

As for May's biggest challenge, FAA reauthorization, most parties agree on at least one element of the discussion: the need to upgrade America's air traffic control.

FORBES: Magazine Article