Confusion over whether the plane had been seen flying west prompted speculation that different arms of the government might have different opinions about its location, or even that authorities were holding back information.
Earlier in the week, Malaysia's head of civil aviation, Azharuddin Abdul Rahman, was asked why the Strait of Malacca was being searched and replied, "There are things I can tell you, and things I can't," suggesting that the government wasn't being completely transparent.
If all those on board are confirmed dead, it would be the deadliest commercial air accident in 10 years.
Choi Tat Sang, a 74-year-old Malaysian, said his family is still holding out hope that the plane and all on board are safe. His 45-year-old daughter-in-law, Goh Sock Lay, was the chief flight attendant. Her 14-year-old daughter, an only child, has been crying every day since the plane's disappearance.
"We are heartbroken. We are continuing to pray for her safety and for everyone on the flight," he said.