Which model of aircraft is referred to as the Embraer Regional Jet?

The correct identification of the Embraer Regional Jet is the ERJ 145. This model is significant within the Embraer family of regional jets and serves long-distance regional routes, typically with a capacity of about 50 passengers. The ERJ series has been widely used for its operational efficiency and comfort in short to medium-haul flights.

The ERJ 175, while also an Embraer model, is an enlarged version of the ERJ 145 designed for a larger passenger capacity and different operational contexts. Despite its similar designation, it is considered a separate model within the Embraer regional jet portfolio.

In contrast, the CRJ 700 is a Bombardier regional jet, not from Embraer, which indicates a clear distinction in manufacturer and design. The A220 is a completely different aircraft developed by Bombardier and later acquired by Airbus; it also does not fall under the Embraer category. Understanding these distinctions helps in recognizing the specific characteristics and classifications of regional jets and their manufacturers.