5 Interesting Facts About the Embraer ERJ Family 

ERJ135ER - Extended range, although this is the baseline 135 model. Simple shrink of the ERJ145, seating thirteen fewer passengers, for a total of 37 passengers.
ERJ135LR - Long Range - increased fuel capacity and upgraded engines.
ERJ140ER - Simple shrink of the ERJ145, seating six fewer passengers for a total of 44 passengers.
ERJ140LR - Long Range (increased fuel capacity (5,187 kg) and upgraded engines.
ERJ145STD - The baseline original, seating for a total of 50 passengers.
ERJ145EU - Model optimized for the European market. Same fuel capacity as 145STD (4,174 kg) but an increased MTOW[27] 19,990 kg
ERJ145ER - Extended Range, although this is the Baseline 145 model.
ERJ145EP - Same fuel capacity as 145ER (4,174 kg) but an increased MTOW 20,990 kg.
ERJ145LR - Long Range - increased fuel capacity (5,187 kg) and upgraded engines.
ERJ145LU - Same fuel capacity as 145LR (5,187 kg) but an increased MTOW 21,990 kg.
ERJ145MK - Same fuel capacity (4,174 kg), landing weight (MLW) and MTOW as in the 145STD, but a changed MZFW[28] (17,700 kg).
ERJ145XR - Extra-long Range, numerous aerodynamic improvements, including winglets, strakes, etc. for lower cruise-configuration drag; a ventral fuel tank (aft location) in addition to the two main larger capacity wing tanks (same tanks as in the LR models); increased weight capacity; higher top speed and up-rated engines.
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