Background: Steely Dan is an American rock band founded by core members Walter Becker (guitars, bass, backing vocals) and Donald Fagen (keyboards, lead vocals) in 1972. Blending elements of jazz, traditional pop, R&B, and sophisticated studio production with cryptic and ironic lyrics, the band enjoyed critical and commercial success starting from the early 1970s until breaking up in 1981. Throughout their career, the duo recorded with a revolving cast of session musicians, and in 1974 retired from live performances to become a studio-only band. Rolling Stone has called them "the perfect musical antiheroes for the Seventies".
Context: The Royal Scam was released in May 1976. Partly because of Carlton's prominent contributions, it is the band's most guitar-oriented album. It also features performances by session drummer Bernard Purdie. The album sold well in the U.S.A., though without the strength of a hit single. "Haitian Divorce" (Top 20) drove sales in the UK, becoming Steely Dan's first major hit in that country.  Steely Dan's sixth album, the jazz-influenced Aja, was released in September 1977. Aja reached the Top Five in the U.S. charts within three weeks, winning the Grammy award for "Engineer - Best Engineered Recording - Non-Classical." It was also one of the first American LPs to be certified 'platinum' for sales of over 1 million albums.  Featuring Michael McDonald's backing vocals, "Peg" (No. 11) was the album's first single, followed by "Josie" (No. 26) and "Deacon Blues" (No. 19). Aja solidified Becker's and Fagen's reputations as songwriters and studio perfectionists. It features such jazz and fusion luminaries as guitarists Larry Carlton and Lee Ritenour; bassist Chuck Rainey; saxophonists Wayne Shorter, Pete Christlieb, and Tom Scott; drummers Steve Gadd, Rick Marotta and Bernard Purdie; pianist Joe Sample and ex-Miles Davis pianist/vibraphonist Victor Feldman and Grammy award-winning producer/arranger Michael Omartian (piano).  Planning to tour in support of Aja, Steely Dan assembled a live band. Rehearsal ended and the tour was canceled when backing musicians began comparing pay. The album's history was documented in an episode of the TV and DVD series Classic Albums.  After Aja's success, Becker and Fagen were asked to write the title track for the movie FM. The movie was a box-office disaster, but the song was a hit, earning Steely Dan another engineering Grammy award. It was a minor hit in the UK and barely missed the Top 20 in the U.S.A.
Question: When did the band release Aja?. Whats the answer?
Steely Dan's sixth album, the jazz-influenced Aja, was released in September 1977.