(Adds context in paragraph 3, details on coordination in...

(Adds context in paragraph 3, details on coordination in paragraphs 2 & 4, quote in paragraphs 5 & 6)

Sept 15 (Reuters) - Australia's competition regulator said on Friday it intended to deny authorisation for Qantas Airways (QAN) and China Eastern Airlines 600115.SS to coordinate operations between the two countries, citing competition concerns amid increased demand.

The Australian Competition and Consumer Commission (ACCC) said an agreement that enabled the two key competitors to coordinate passenger and cargo transport operations between Australia and China until the end of March 2024 could potentially breach competition laws.

Qantas has been under the radar with the flagship carrier suffering a string of reputational damage after the ACCC initiated legal proceedings for allegedly selling tickets for thousands of cancelled flights.

The regulator had previously granted the two airlines an interim authorization seeking time to further assess the implications of the coordination for public benefits.

ACCC Commissioner Anna Brakey said any additional services on routes other than Sydney- Shanghai could potentially be a public benefit but added that the ACCC was not satisfied they were likely to kick-start between now and March 2024.

"A key difference between now and the previous authorisations is we have not been provided with sufficient evidence that the coordination would lead to additional services on other routes between Australia and China," she added.

The regulator, however, said the interim authorisation remained in place with the two airlines expected to make submissions for the regulator to change their mind on ending the authorisation.

The two airlines did not immediately respond to a Reuters request for comment.