FILE PHOTO: A couple stand near an empty Niki customer care desk at Palma de Mallorca airport, Spain, December 14, 2017. REUTERS/Clara Margais

FRANKFURT (Reuters) - British Airways owner IAG ICAG.L is negotiating exclusively with Niki's insolvency administrator to take over the collapsed Austrian airline, a source close to the process said on Thursday.

“IAG is the last remaining bidder and is still negotiating now,” the person said, adding that the company had put in the highest offer - a double-digit million-euro amount.