London, England (CNN) -- British mediators said Thursday they are trying to restart talks between British Airways and the union representing its striking cabin crews after negotiations adjourned overnight.
There was no word on when BA and the Unite union would restart their talks, said a spokeswoman for the Advisory, Conciliation and Arbitration Service (ACAS), which is mediating the talks.
They met for a "few hours" Wednesday night and adjourned around 10 p.m. (5 p.m. ET), said the spokeswoman, who declined to be named in line with policy.
BA cabin crews went on strike Monday in a dispute with the airline over pay and working conditions. The strike is due to end Friday but two more are planned in the coming weeks.
Talks last weekend to avert the strikes failed.
British Airways has managed to fly more than half of its scheduled flights during the strike as a result of leasing planes and pilots and putting passengers on other airlines.
Union members also crossed picket lines and decided to work this week, BA said, enabling the airline to expand its planned schedule for the second strike next week.
BA will operate more than 70 percent of its long-haul flights from its main hub at Heathrow airport next week, up from more than 60 percent this week, and more than 55 percent of its short-haul flights from Heathrow, up from more than 50 percent this week, it said.
"Due to the numbers of crew wanting to work normally at Gatwick, all flights will continue to operate as scheduled" during next week's strike, BA said.
The airline said it expects to fly more than 75 percent of its customers who already have reservations during the next strike, which runs from May 30 to June 3.