The RJ (or ERJ) 145 is a jet built by the Brazilian company Embraer for use on regional air routes.
The ERJ is operated by the following airlines:
AeroMexico Connect
Alitalia Express
Flybe
Bmi Regional
LOT Polish Airlines
Luxair
PGA-Portugalia
Air France Regional
American Eagle Airlines
Chautauqua Airlines
ExpressJet Airlines
Freedom Airlines
Trans States Airlines
Other smaller carriers
A typical layout for the ERJ 145 (ExpressJet layout) has three rows of seats. The aircraft has three seats across its width with a walkway between the first and second row of seats. The aircraft also has a Lavatory in the back and galley space near the front.
References
http://en.wikipedia.org/wiki/Embraer_145
http://www.seatguru.com/airlines/ExpressJet/ExpressJet_Embraer_ERJ-145.php
It is 5187 kg, but it depends on the type of 145.
I think they are jet aircraft although they have turbofan engines. You can check more on thee link below
Embraer
About 50, depending on the airline and the exact model of aircraft.
It is the Embraer ERJ-145 XR. Operated by Expressjet ( Continental express, United Express)
Most likely an Embraer ERJ-190 or 195 or a Bombardier CRJ700 or 900.
The ERJ-170 is a Brazilian built, twin engine, 70 passenger jet aircraft. It is built by Embraer.
Embraer was created in 1969.
The Embraer ERJ145 seats 50 passengers.
Factor conditions differ for Embraer and Bombardier in the sense that Brazil has a much higher demand for Embraer and a much lower demand for Bombardier.
Depends on the aircraft. Some planes such as the 787 and 320 can carry up too 250 passengers, While an Embraer 145 can only hold about 25-45.
EJR