The Texas-based operator is set to take delivery of the new planes in the coming months, bringing its fleet of E-jets to a total of 134. Once delivered, the airline's fleet will comprise 107 E175s and 27 E170s.
Envoy also operates 22 previous-generation, 50-seat ERJ-145s, which are almost 20 years old.
"As we move away from the E145 and concentrate on our large (regional jet) business, American continues to invest and have faith in Envoy's ability to give safe, dependable, and cost-effective service to its clients," Envoy's Senior Vice-President of Air Operations Dee Temples said.
"Envoy has invested significantly in the resources and infrastructure needed to support our Embraer E-Jet fleet and deliver outstanding service to American's customers," Temples added.
Envoy Air is one of three regional airlines operating on behalf of American Airlines alongside Maryland-based Piedmont Airlines and Ohio-based PSA Airlines. The airline has not yet provided further details about where the six additional E175 aircraft will be sourced from.
At the JPMorgan 2023 Industrials Conference on March 14, CEO Robert Isom drew attention to the fact that American Airlines' regional jet fleet is not being fully utilized. According to Isom's estimates, there are currently between 30 and 50 mainline aircraft and over 150 regional aircraft that are barely being used.