The planes must have 160-190 seats, preferable new or no older than six years.
Tarom has dropped several routes in the past year or lowered flight frequency on less profitable routes.
Last year, Tarom leased two Boeing 737-800 NG to replace two Airbus aircraft it had retired from its fleet.
Tarom currently has a fleet of 23 aircraft.
The latest estimates showed Tarom would post a loss of RON206.7 million for 2017. In the 2009-2017 period, Tarom amassed losses of RON1.6 billion (EUR360 million.