JAKARTA - Indonesia's transport ministry has cracked down on the sale of cheap tickets for domestic flights to ensure airlines do not cut corners on safety, authorities said on Thursday, just over a week after an AirAsia flight crashed into the Java Sea.

The decision to tighten the rules on bargain fares came into effect on Dec 30, two days after Flight QZ8501 crashed en route from Indonesia's second-biggest city of Surabaya to Singapore. There were no survivors among the 162 people on board.

The transport ministry has raised the ticket price floor for economy class domestic flights, according to ministry documents.

The ministry hopes the new rule will help airlines increase their profit margins so they can spend more on safety.

"We want the aviation sector to be healthy, not cheap. If it's cheap, there are many things that might not be done," Indonesian Transport Minister Ignasius Jonan told reporters on Thursday.

Airlines have to strike a balance between ensuring the safety of passengers and operational costs, Mohammad Alwi, an official at the transport ministry, told a news conference in Jakarta.

Indonesia has one of the world's fastest growth rates in commercial aviation, but its safety record is patchy. In 2007 the European Commission banned all Indonesia-based airlines from flying to the European Union following a series of accidents.

Exemptions to that ban have since been granted to some carriers, including Garuda Indonesia and AirAsia.

Since the Indonesia AirAsia crash, the transport ministry has reassigned some officials and tightened rules on pre-flight procedures.