Talks have again broken off and there's no end in sight to the nine-month-old strike at St. John's International Airport.

The airport authority and the Public Service Alliance of Canada held 10 days exploratory talks in Ottawa and St. John's over the past month, but an agreement on all issues couldn't be reached.

Meanwhile, the union is blaming the airport for the most recent collapse in talks.

Chris Aylward, a spokesperson for the Public Service Alliance of Canada, said both sides were close to a deal when management negotiators walked away from the table on Tuesday.

Aylward said he's at a loss to explain why the airport authority would abandon talks when progress was being made.

The workers have been on strike since Sept. 11, 2012.

There's no word on when talks might resume.