WASHINGTON (Reuters) – A union representing pilots at Southwest Airlines Co (LUV.N) on Monday said it believes the grounded Boeing 737 MAX (BA.N) will likely return to the skies in “probably a February time frame to say the least.”

Southwest, United Airlines (AAL.O) and American Airlines (AAL.O) have all pushed back the estimated return of the plane to January. A key step — a certification test flight by Boeing — is not expected until early November. Boeing has said it hopes flights can resume before the end of the year.