A Look Out Circular (LoC) has been issued against the passenger who urinated on a co-flyer in an Air India New York-Delhi flight, reported ANI.
Only four crew members have joined the investigation so far and others are expected to join the probe today.
The Delhi Police on Thursday had urged the Bureau of Immigration to issue LoC against the man to prevent him from leaving the country.
The police also said multiple teams were sent to Mumbai to nab the man but he was absconding.
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The Delhi Police registered an FIR against the man on Wednesday based on the complaint given by the victim to Air India, they said.
In the shocking incident, the accused, allegedly in an inebriated condition, had urinated on his co-passenger, a senior citizen in her seventies, in the business class of an Air India New York-Delhi flight on November 26 last year.
The police said the accused, Shankar Mishra, is the vice-president of the India Chapter of an American multinational financial services company headquartered in California.
"We have written to the authorities in the immigration department to issue lookout circular against the accused to prevent him from leaving the country," a senior police official said.
He added, "Mishra is a resident of Mumbai. We had sent our teams to Mumbai at his known locations but he was absconding. Our teams are trying to trace him".
Holding that Air India's conduct appeared to be "unprofessional", aviation regulator DGCA on Thursday issued notices to the officials and crew of the New York-Delhi flight, asking why action should not be taken against them for "dereliction" of duty while handling the November 26 ''urination'' incident.
Based on the victim's complaint, a case was registered under Indian Penal Code sections 294 (obscene act in public place), 354 (assault or criminal force to woman with intent to outrage her modesty), 509 (word, gesture or act intended to insult the modesty of a woman) and 510 (misconduct in public by a drunken person) as well as under Aircraft Rules.
Air India on Wednesday had said that it has imposed a 30-day flying ban on the accused passenger and set up an internal panel to probe whether there were lapses on part of the crew in addressing the situation.
(With inputs from PTI)