UA Orders 737-700's to Replace CRJ's, ERJ's...

United Airlines today announced an order to purchase 25 new Boeing 737-700 aircraft. The order is in addition to the previously announced order of 40 737-700s. United will take delivery of the aircraft beginning at the end of 2017.

The new 737-700 aircraft will enable United to continue utilizing larger, more efficient aircraft as the airline reduces the size of its 50-seat regional fleet. United expects to have fewer than 100 aircraft in its 50-seat fleet by the end of 2019.
The next-generation 737-700s provide a superior customer experience by featuring cabin enhancements including larger overhead bins that can accommodate additional carry-on bags. The aircraft's Boeing Sky Interior creates a larger sense of space through sculpted sidewall panels and LED cabin lighting that mimics soft blue skies and sunset colors.
United also announced that the carrier will retire its 747 fleet from scheduled service by the end of 2018. Additionally, the airline announced that it will be converting 787 orders originally anticipated for delivery in 2020 and beyond into four 777-300ERs and five 787-9s beginning in 2017. These conversions will accommodate the accelerated retirement of the 747s while also meeting United's capacity needs.

For what it's worth, we're not directly replacing CRJs with 737s, generally speaking. CRJs may be replaced with CR7s or Embraer 170-175s, and those may be replaced by mainline flights.

That said, DEN-MSN had been running with a mix of CRJs, ERJs, and CR7s. Now we've got 2 A319s daily, and as a DEN resident with in-laws in MSN, I love it :-D