He was appointed by his party in 2009 to replace former leader Abdullah Badawi.
An Egyptian pilot and another Egyptian also were on board, Luxor province spokesman Badawi al-Masri said.
In October last year a pro-business moderate, Abdullah Badawi, was elected to succeed Mahathir.
Mr Najib Razak assumed office in the wake of the election, replacing Abdullah Ahmad Badawi.
BBC: Malaysian PM Najib Razak paves way for general election
There is one item on the opposition's agenda, however, that Mr Badawi seems likely to neglect.
ECONOMIST: Dr Mahathir's old party has done better without him
UMNO's "Mr. Clean", Foreign Minister Abdullah Badawi, ousted three years ago, was swept back in.
An Egyptian pilot and another Egyptian were also aboard, Luxor province spokesman Badawi al-Masri said.
CNN: Official: Egypt balloon explosion probe can take 2 weeks
Malaysia's prime minister, Abdullah Badawi, and Indonesia's President Susilo Bambang Yudhoyono, have tried to calm things.
Mr Badawi can expect a longish honeymoon, probably up to the general election due next year.
Al-Badawi was interrogated by NCIS Special Agent Ken Reuwer and my colleague, FBI Special Agent Ali Soufan.
FORBES: Al Qaeda's Dumbest Terrorists Part II: The Human Polygraph Machine
So Mr Badawi's survival rests on how his new ministerial line-up is received and how well it performs.
Mr Badawi is fighting for survival after his coalition's poor showing against the opposition in elections in March.
ECONOMIST: The opposition leader and another critic arrested
One example is what happened to Badawi after he confessed his role in the murder of 17 U.S. sailors.
FORBES: Al Qaeda's Dumbest Terrorists Part II: The Human Polygraph Machine
Another welcome move by Mr Badawi, if followed through, is that ministers will be required to disclose their assets.
There is much speculation that Dr Mahathir may work out a lengthy handover period with Mr Badawi, his likely successor.
It also includes noted UMNO critics of Mr. Mahathir such as Khairy Jamaluddin, son-in-law of previous Prime Minister Abdullah Badawi.
And a group of 581 Malaysian journalists and editors handed Mr Badawi a petition urging him to loosen press restrictions.
Similarly, Mr Najib took over after an internal party coup in April 2009 against the then prime minister, Abdullah Badawi.
Badawi seemed unnerved by the silent passing of notes, so Agent Soufan asked if he wanted to see what was written.
FORBES: Al Qaeda's Dumbest Terrorists Part II: The Human Polygraph Machine
Badawi went red, apparently embarrassed that his emotions were showing, and declined.
FORBES: Al Qaeda's Dumbest Terrorists Part II: The Human Polygraph Machine
"No one wanted to take his case, " said Waleed Abualkhair, Badawi's attorney.
La presentadora de la BBC, Zeinab Badawi, y el presentador de Al Jazeera, Stephen Cole, son los encargados de moderar el Foro.
Mr. Najib came to power after his predecessor, Abdullah Badawi, failed to win the National Front's customary two-thirds control of parliament in 2008.
Evidence has recently emerged that seems to support Mr Anwar's claims of political interference in the judiciary, both under Mr Badawi and Dr Mahathir.
ECONOMIST: The opposition leader and another critic arrested
It was revealed that Mr Badawi's predecessor, Mahathir Mohamad, had been brokering secret talks between Thai officials and southern separatists even before Mr Thaksin's downfall.
Mr Badawi was indeed an important factor in the election, but probably as much for his unsullied and gentlemanly reputation as for his Islamic credentials.
ECONOMIST: Dr Mahathir's old party has done better without him
The challenges to Prime Minister Abdullah Ahmad Badawi--from many sides--are clear.
His successor, Abdullah Badawi, is wooing investors back with tax breaks.
The Malaysian stock market is up 30% since Badawi took over.
One possible anxiety for Mr Badawi is whether, in retirement, Dr Mahathir, a spirited 77, will seek to have a continuing influence on Malaysian politics.
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