Republic Airways, the US regional airline group, has signed a firm order with Embraer for five E175 aircraft.
The deal, valued at $222m based on current list prices, will see the new aircraft delivered to Republic in mid-2016.
The latest order follows on from two large orders placed by Republic in the past two years.
In January 2013, it placed an order for 47 aircraft, following up with an order for another 50 in September last year.
Republic, operator of the world’s largest E-Jet fleet, also maintains options for a further 32 E175s.