Co-written and first recorded by Terry Stafford (C&W #31 1973).
Also recorded by Chris LeDoux (1975).
Other hit version by George Strait (C&W #4/CAN #1 1983).
From the wiki: “‘Amarillo by Morning’ was written by Terry Stafford (‘Suspicion‘) and Paul Fraser, and was first recorded by Stafford in 1973 on his album Say, Has Anybody Seen My Sweet Gypsy Rose. Stafford says he conceived the song after playing with his band at a rodeo in San Antonio, Texas, and then driving back to his home in Amarillo, TX. It was first covered in 1975 by bona fide rodeo champion Chris LeDoux, with no apparent chart success. ‘Amarillo by Morning’ was again covered, in 1983, by George Strait, for his 1982 album Strait from the Heart, his third Country Top-5 hit and topping the Canadian Country chart for the second time.”