The combination of increased capacity and range offered by the 767 - 300ER was particularly attractive to both new and existing 767 operators , making it the most successful version of the aircraft , with more orders for this type than all other variants combined .
The combination of increased capacity and range offered by the 767 - 300ER has been particularly attractive to both new and existing 767 operators . 
 It is the most successful version of the aircraft , with more orders placed than all other variants combined .