Virgin Australia says Qantas has provided no new evidence to justify a re-assessment of its proposed codeshare with Cathay Pacific on Australia-Hong Kong routes.

Cathay Pacific has warned of "tremendous pressure" on yields amid strong competition, slowing demand for air travel and a difficult cargo market.

Cathay Pacific says a proposed codeshare agreement with Qantas would encourage more tourists to visit Australia and benefit the national economy.

Hong Kong's privacy commissioner for personal data Stephen Wong says elements of Cathay Pacific's IT systems were "too lax" in securing passenger data prior to a data breach.