Strict currency controls were first imposed in Venezuela in 2003 by late President Hugo Chavez.
The restrictions were further tightened two years ago, forcing several airlines to reduce their operations in the country as they struggled to repatriate billions of dollars in revenue held in the local currency - the bolivar.
Some airlines are now requiring passengers to pay their fares in dollars.
Venezuela's government has defended its policies, saying it must prioritise.
Caracas says it is using its foreign reserves - which are now scarce - to pay for essential items such as medicines and industrial machinery.