• BREAKING NEWS ABC shows live and on-demand -- Download the WATCH ABC app!

United's 787 Dreamliners back in service

A Boeing 787 Dreamliner is seen landing at Los Angeles International Airport in this undated file photo.

May 20, 2013 12:00:00 AM PDT
United's 787 Dreamliner jets are officially back in service after being grounded for four months because of smoldering batteries on 787s owned by other airlines.

United's first 787 flight took off at 9 a.m. PT Monday from Houston to Chicago.

United and airlines around the world grounded their Dreamliner fleets in January after incidents that included an emergency landing of one plane and a fire on another. The incidents never caused any serious injuries.

Since then, Boeing put a new battery system into the 50 787 jets already in service around the world. Federal authorities lifted the grounding order on April 19.

United is planning to use 787s on shorter domestic flights before resuming international flights on June 10 with new Denver-to-Tokyo service as well as temporary Houston-to-London flights. It's adding flights to Tokyo, Shanghai, and Lagos, Nigeria, in August.

United hopes to resume Dreamliner service at LAX sometime this week.

The Associated Press contributed to this report.