The comments come after Tan was reported by ABS-CBN news.com at the weekend as saying he wanted to offload PAL, Asia's oldest airline, "at the right price".
In December, Ang confirmed that PAL was seeking San Miguel investment to help pay for a refleeting programme.
Presidential spokesman Edwin Lacierda said: "We welcome the additional investment of whoever would like to buy PAL because it would mean additional investments to the country.
"Considering the PAL is our national brand, the additional investments would improve the branding of our national carrier," he added.
PAL's image, and that of the country, was battered in September after a wildcat strike over Tan's proposal to outsource thousands of jobs, which led to the cancellation of hundreds of flights.
The airline has also been hit by soaring fuel prices, political turmoil in the Middle East, the Japan earthquake-tsunami disaster and competition from low-cost local carriers.
Communist insurgents in the Philippines have stepped up "extortion-based violence" and attacks on "soft targets" to raise funds amid waning public support, a military statement said.
Such attacks caused damage to property worth 1.2 billion pesos ($27.7 million) last year and raised at least 300 million pesos in extortion funds for the underground New People's Army (NPA), the statement released on Sunday said.
The attacks caused much fear in the mining sector, which has been trying to attract foreign investment.
"A major cause as to why the NPA is resorting to this extortion-based violence is its continuously declining mass-base support," the statement said.
"This has led them to resort to force and intimidation to coerce 'soft targets' including private firms and individuals."
The rebels are also resorting to fewer direct attacks on the military and were instead going after village defence forces, who are not as well-armed and trained.
About 100 soldiers, policemen and militiamen were killed in NPA attacks last year, down from 184 in the previous year, the statement said.
The NPA's strength has fallen to just over 4,000 last year from about 4,300 in 2010, it added.
The government has opened peace talks with the communists but negotiations reached an impasse in November after Manila rejected rebel demands to free 18 jailed guerrillas the NPA said were consultants to its negotiating team.
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