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The airline said it has conducted systematic tests, structural checkups and verified airworthiness data for each of the aircraft as an emergency measure to ensure safety.

The circular called for carrying out in-depth research and assessment of safety risks brought about by rising commodity prices, inauguration of major projects, drops in income in transportation and tourism sectors, as well as rising manufacturing costs.

Also on Tuesday, more than 2,000 search and rescue workers intensified efforts to recover the aircraft's two black boxes, or flight data recorders, to investigate the cause of the tragedy.

The safety overhaul covers all regional air-traffic management bureaus, companies involved in civil aviation transport and general aviation, relevant service providers, airport operators, flight training organizations, among others.

Subway stations have also set up baby care rooms and are now equipped with trolleys, emergency umbrellas and medical kits.