Correspondents say some people have called into question Pakistan's system of regulating air safety.
France's air safety investigation agency said on Friday that the messages revealed an "inconsistency in the different speeds measured".
Air safety regulations, of course, would remain the responsibility of the federal government.
The European air safety body, Eurocontrol, said the cloud of ash had reached 55, 000ft and was expected to move through northern UK and Scotland.
Yet the link between economic hardship and air safety is tenuous.
The Federal Aviation Administration, which is responsible for air safety, launched a comprehensive examination on Friday of the Dreamliner's design as well as its manufacture and assembly.
Like many congested urban airports, Sao Paulo's domestic air travel hub is surrounded by development and has no room for the runway extensions recommended by air safety groups.
NPR: Brazilian Prosecutors Seek to Close Airport After Crash
The Abhijit Air Safety Foundation - formed in honour of fighter pilot Abhijit Gadgil who was killed in a crash three years ago - has been lobbying against the use of MiGs.
Closing the airport would likely create huge problems for civil aviation throughout Latin America's largest nation because Congonhas is a key hub, but prosecutors said the move is essential to ensuring air safety.
NPR: Brazilian Prosecutors Seek to Close Airport After Crash
In recent years, former Soviet republics have had some of the world's worst air traffic safety records.
Most of the aviation fatalities in 2011 occurred in Russia, Iran and African countries that have long faced air-safety problems, such as Angola and Congo.
Separately, the NTSB said U.S. air-safety regulators will have to reconsider how the Dreamliner was approved to carry passengers because some of the assumptions used turned out to be faulty.
Federal agencies collect enormous amounts of data about such diverse matters as automobile safety, air travel, air quality, workplace safety, drug safety, nutrition, crime, obesity, the employment market, and health care.
More has been spent on airports recently, thanks to aid from America and to the pressure of international air-safety groups, which try to ensure that aircraft landing fees are not spirited away by governments.
"We would put up our firefighting response against any airport in the country, as borne out by repeated citations in National Air Traffic Safety Board reports, " Port Authority PBA President Paul Nunziato said in a statement.
At a time when planes are becoming more crowded, air traffic is growing and air traffic control con- tinues to be run with obsolete technology, gratuitously retiring veteran pilots is both preposterous and an air-safety hazard.
The plane's grounding on Jan. 16, an enormous black eye for Boeing, marked the first time since 1979 that FAA had ordered every plane of a particular type to stay out of the air for safety reasons.
The trade group International Air Transport Association does its own safety audits on air carriers.
Somehow all those 10% and 15% savings seem to disappear because other things are added, like more air bags, safety equipment or entertainment systems.
After that accident, there was a temporary suspension of hot air balloon flights while safety measures were improved.
The Department of Homeland Security is also taking steps to enhance the safety of air travel, including additional cargo screening.
Why not add more steel, more air bags or other safety devices?
He served as an instructor and Air Line Pilots Association safety chairman, accident investigator and national technical committee member, according to a biography on the site.
He was an instructor and Air Line Pilots Association safety chairman, accident investigator and national technical committee member, according to a biography on the Web site of his company.
But the overall air system's safety is built on redundancy, and taking away the controller's extra set of eyes is like removing stop signs or traffic lights from city intersections and forcing drivers to be more vigilant and cautious, says Paul Rinaldi, president of the National Air Traffic Controllers Association.
Despite the unfortunate timing, USA Today was right to note air travel's extraordinary safety.
He participated in several U.S. Air Force and National Transportation Safety Board accident investigations, and worked with NASA scientists on a paper on error and aviation, according to his resume.
The administration's funding authorization expires Sept. 30, and it needs more money to address the booming volume of air traffic, primarily because the air traffic control system needs safety and security upgrades.
John took a chance on an idea he cared about, and co-founded the Natural Resources Defense Council, which grew into a powerful and important voice in protecting the safety of our air and water.
WHITEHOUSE: President Obama Nominates New Commerce Secretary
Lion Air's pilot training and safety procedures are likely to be closely scrutinized.
WSJ: Weather Scrutinized as Possible Cause of Lion Air Crash
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