The planes consisted of 12 Boeing 737-500s, five Boeing 737-800 NGs and five Embraer E-190s, PT Sriwijaya Air President Director Chandra Lie said.
"The addition of planes will serve as the company`s strength to realize its commitment to upholding safety and services," he said in a written statement.
The arrival of new airplanes to replace aging ones would strengthen the airline`s fleet to expand its flight routes, he said.
"The arrival of Boeing 737-500s at the end of the first quarter of 2012 will serve as a milestone for us to make a significant change in which customers will enjoy Sriwijaya Air`s new services which will be more interesting and have special values for customers," he said.
The Boeing 737-500s would serve both business and economic class passengers, he said.
The introduction of business-class seats would make Sriwijaya Air an airline with new services, namely two classes in one flight, he said.
Sriwijaya Air is currently operating a total of 30 airplanes of different types.