They had a delivery schedule graph on the Q4 earnings report.

2016:
UA: 14
Alaska: 10
DL: 13
Total: 37

2017:
UA: 11
DL: 6
Total: 17
Total number of 175s in fleet after the final one is delivered= 99. We had 45 at the start of 2016.
On a side note, I thought we were only getting 18 additional ones for UA, but the earnings report stated another 25 have yet to be delivered for a total of 65 in the UA system by mid 2017. Has the additional 7 been officially announced?
When the last 175 is delivered, the fleet makeup will look as follows:
UA:65
DL:19
AK:15