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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.