US Airways ordered 100 Airbus A321neo (A321-200 with New Engine Option, using the CFM International LEAP-1A engine and Sharklets wingtip devices) for delivery beginning 2019. The aircraft performed its maiden flight February of 2016. (Current coding would have this as "32B" because of the Sharklets, but IATA may use new Equipment Codes for the MAX and neo aircraft.)
Link to IATA aircraft equipment codes c/o flugzeuginfo.net
"For the A321neo – which performed its maiden flight in February 2016 – Airbus is increasing seating capacity with optimised use of cabin space, increased exit limits and a new cabin door configuration. This “Cabin-Flex” option will increase the jetliner’s maximum certified capacity to 240 seats (single class), while still accommodating Airbus’ modern comfort standard of at least 18-inch wide seats." (Airbus)
Seating will be F20 Y176 (less than the 206 two class maximum) due to F, MCE and MC. Improvements include quieter operation, greater payload, range extension and a 20% reduction in fuel use per seat. The aircraft is designed to replace the Boeing 757-200.
The Airbus A321neo prototype, D-AVXB, first flew on 9 February 2016 (with Pratt & Whitney PW1100G-JM geared turbofan engines). Maximum range is expected to be 6,500 km (3,500 nm) for the A321neo without LR capabilities.