I bet they put the 175s over 5 years at the current AMR Eagle and then bid out all the other flying to other airlines who have extra 50 seaters. They get a good exchange rate on these things with EMJ while trading in all the EMJs we have now. Just a guess, but it matches the planned 210ish planes planned to be at current Eagle, and the price of 50 seat feed is going to a good deal going forward.