MANILA - Philippine Airlines on Tuesday advised passengers of international flights to be at the airport up to five hours before departure in anticipation of long lines at immigration counters.

"Please come early in anticipation of long immigration lines," the flag carrier said.

Immigration officers have gone on mass leave to protest alleged non-payment of overtime work.

Justice Secretary Vitaliano Aguirre, who said more than 30 personnel have resigned and 50 others are on leave, admitted that the problem may extend until the Holy Week.

Manila International Aviation Authority (MIAA) General Manager Ed Monreal insisted, however, that they have a "contingency plan" to ensure normal operation despite the mass leave.