Because of more than three years of development delays and a vigorous technological response by an established competitor, Mitsubishi Aircraft's (IW 1000/140) forthcoming MRJ may quickly lose much of its efficiency advantage.
First delivery for the MRJ program is now due in mid 2017, but by 2020 a heavily updated version of the most closely comparable Embraer (IW 1000/654) E Jet should go into service.
The Embraer 175-E2, as it is called, will reply not only by adopting the MRJ's engine; but it will also have improved avionics and, most notably, a new wing.