American Airlines has updated about half of its old American and US Airways airplanes with a new paint job and livery but a busy summer schedule will delay some work.

The Fort Worth-based company’s “Arrivals” employee newsletter said American expects the last of its mainline fleet will be repainted by late 2017, The Dallas Morning News reported Friday.

The carriers finished their merger in December 2013. The paint scheme, including a U.S. flag-type design on the tail, was adopted earlier that year. Any American or US Airways planes to be retired by the fourth quarter of 2017 will not be repainted.

American’s count indicates that 312 of 626 mainline airplanes have been repainted, the newspaper reported.

Contractors in Amarillo, Roswell, New Mexico, and Peru, Indiana, are operating a total of eight paint lines to redo the fleet. Each paint job has five coats — a primer, the main paint, a mica coat and two clear coats.

A narrow-body airplane like the Boeing 737 takes about 10 days to paint. Painting has been suspended until August because American needs all airplanes to operate its summer schedule.

About half the regional fleet has been repainted, including 85 percent of Envoy Air’s jets. Envoy was renamed from American Eagle Airlines Inc. in April 2014.

Photo Credit: These designs on older American Airlines and US Airways planes are disappearing quickly. Susan Walsh / Associated Press