Asiana Airlines and United Airlines are expanding their codeshare agreement to include Asiana’s flights between Seoul Incheon and Chicago O’Hare International Airport, and United’s domestic routes from Chicago.

The codeshare is due to take effect on March 17, though reservations for the flights have already opened. United will be placing its UA code on Asiana’s OZ236 and OZ235 flights between Seoul and Chicago, while Asiana’s OZ code will be added to 16 of United’s routes from Chicago to domestic destinations, notably Pittsburgh and Boston.

“The expansion of the codeshare with United Airlines is a part of Asiana Airlines’ strategy for strengthening its network to and from the US,” the Korean carrier said in a statement. “Asiana Airlines will continue to deepen its partnership with United Airlines to achieve customer satisfaction travelling to America.”

Once the codeshare comes into effect later this month, Asiana and United will be codesharing on all flights operated by Asiana to continental US, which includes services to Los Angeles, New York, San Francisco and Seattle.

Asiana flies non-stop between Seoul and Chicago five times weekly. Its service currently flies on Monday, Wednesday, Friday, Saturday and Sunday, though from March 26 to October 28 the service will change its Saturday operation to a Thursday operation.

Details of Asiana’s Seoul Incheon (ICN)-Chicago O’Hare (ORD) are as follows (all times local):

Flight No. From To Date Departs Arrives
OZ236/UA7316 ICN ORD 12/3-25/3 2020 1940
26/3-28/10 1935
OZ235/UA7315 ORD ICN 12/3-25/3 2355 0400+2