Months before the Malaysia Airlines jet vanished, US regulators had warned of a "cracking and corrosion" problem on Boeing 777s that could lead to a mid-air breakup and drastic drop in cabin pressure.
"We are issuing this AD (Airworthiness Directive) to detect and correct cracking and corrosion in the fuselage skin, which could lead to rapid decompression and loss of structural integrity of the airplane," the Federal Aviation Administration said.
It had circulated a draft of the warning in September, issuing a final directive on March 5, three days before MH370 disappeared.
In Malaysia, frustrations were boiling over with the country's active social media and some press outlets turning from sympathy for the families of relatives to anger over the fruitless search.
"The mood among Malaysians now is moving from patience... to embarrassment and anger over discrepancies about passengers, offloaded baggage and concealed information about its last known position," Malaysian Insider, a leading news portal, said in a commentary.
Twitter users took aim at the web of contradictory information that has fuelled conspiracy theories.
"If the Malaysian military did not see MH370 turn toward the Malacca Strait, then why the search? Who decided to look there and why?" one comment said.
The anger was compounded by a report aired on Australian television of a past cockpit security breach involving the co-pilot of the missing jet.
Malaysia Airlines said it was "shocked" over allegations that First Officer Fariq Abdul Hamid, 27, along with a fellow pilot, violated airline rules in 2011 by allowing two young South African women into their cockpit during a flight.
Crowdsource search for plane
Hundreds of thousands of volunteers are examining images to try and find the missing plane, which disappeared on Saturday.
DigitalGlobal activated its crowdsourcing platform Monday in an effort to locate the Boeing 777 that mysteriously disappeared Saturday en route from Kuala Lumpur to Beijing with 239 people aboard.
The company invited volunteers to comb through images from its Tomnod platform of satellite images for clues that may help locate the aircraft.
DigitalGlobe says it operates "the world's most advanced constellation of commercial imaging satellites" and that after the plane went missing, it activated its emergency system.
Two of the company's satellites collected imagery Sunday of the area where evidence suggested the aircraft may have crashed into the water -- where the Gulf of Thailand meets the South China Sea.
The DigitalGlobe website posted comments from people offering to help and those frustrated when the system went down.
Several comments said simply "count me in," while one visitor wrote: "I am a former Navy patrol plane commander. I believe I can tell aircraft debris when I see it."
The crowdsourcing effort overloaded the servers on Wednesday, with the digital company struggling to handle the huge number of people trying to find the plane.
"We are working to best handle an unprecedented level of Web traffic and interest in supporting the search," the company said at the time.
"Please check back soon. We have new imagery collections planned for today and hope to make those images available online for the crowd as soon as possible."
As of 7am this morning, the site was working intermittently.