"We regret that the illegal strike has still not been withdrawn and normalcy has not been restored in the company, thereby continuing to cripple and paralyse the working of the entire airline," spokesman Prakash Mirpuri said in a statement late on Thursday.
He said the airline was extending what it describes as a partial lock-out to Friday, Oct. 12, "or up to such earlier date on which the said illegal strike is called off."
Talks between airline management and Delhi-based pilots and engineers on Thursday failed to resolve the standoff. Similar talks in Mumbai on Wednesday ended in what one senior pilot called a stalemate.
Before this week, Kingfisher, once India's second-largest airline, was flying only 10 planes out of a fleet that once numbered 64.
Kingfisher is saddled with $1.4 billion in debt, owed mostly to government banks led by State Bank of India, and has failed thus far in its efforts to find an overseas airline or other investor to inject fresh equity into the company.
An official with India's aviation regulator said on Tuesday that Kingfisher would not get government approval to resume flying unless it pays salaries and submits an acceptable recovery plan.
On Thursday, Kingfisher shares fell 4.8% to 13.90 rupees, effectively at their daily limit of 5 percent for the fourth straight session.