A spokeswoman from Gate Gourmet, the Dutch caterer used by Delta, has said that the company is cooperating fully with investigators. Christina Ulosevich added that "details of this matter must remain confidential".
Gate Gourmet is a subsidiary of Swiss-based gategroup Holding AG, one of the largest independent global providers of airline passenger products and services.
More top news
The Labour leader has called the Norwich South MP's remark "completely unacceptable" and says Clive Lewis has personally apologised to him.
Jamie Harron, was arrested in July over the incident in which he said he put his hand on a man's hip to avoid spilling a drink in a bar.
An English woman has died and four other people have been injured in a boat accident on the River Rhone in southern France.