"The statements of around 15 AirIndia staffers who witnessed the assault on Sukumar were recorded. The CCTV footage and other videos capturing the incident were also obtained," said a senior police officer.
The 57-year-old first-term MP had repeatedly hit the Air India staffer on March 23 after the Pune-Delhi flight landed in the national
capital. He was furious at having to fly economy on an all-economy flight despite having a business class coupon.
A case was registered by the Delhi police in connection with the incident on Friday. Later, the case was transferred to the Crime Branch.
The incident had led to widespread condemnation and outrage as a purported video clip of the episode went viral on social media.
The officer added that the possibility of arrest of the MP could not be commented upon as the matter was under investigation.