The airport rail operator claims it is owed $4.75 million after negotiations collapsed over reduced revenue from the state’s flat-fare policy.

The airport rail operator claims it is owed $4.75 million after negotiations collapsed over reduced revenue from the state’s flat-fare policy.

Airtrain is suing the Queensland government over its 50-cent fares.

Brisbane's Air train is suing the Queensland government, following the rollout of the state's 50-cent fare scheme.