Bolivian military and police forces have taken control of four main airports, aiming to break an airline workers' strike in major cities.
Employees from the country's main airline, Lloyd Aereo Boliviano (LAB), are demanding its nationalisation.
But President Evo Morales has ruled out nationalisation, saying the partially private company is seriously corrupt.
The government said it took control of airports in an effort to avoid accidents and ensure passenger safety.
The Bolivian state already holds a 48% stake in the LAB.