The company filed for Chapter 11 protection in January 1991.
In 2002, it sought Chapter 11 protection from its creditors.
Officials at each airline said a final decision had not been made to seek Chapter 11 protection.
The unit itself filed for Chapter 11 protection three months later.
On June 22, 2009, the company filed for Chapter 11 protection.
Ames lost $793.5 million last year and is operating under Chapter 11 protection.
G-1 was driven to seek Chapter 11 protection in 2001 as a result of some 150,000 asbestos claims.
The company has been operating under Chapter 11 protection since last February.
That was 13 months after Eastern had sought Chapter 11 protection, during which it lost $1.2 billion.
United filed for Chapter 11 protection shortly after the board rejected its request.
