Story highlights Airlines in Mexico are implementing new security checks that US announced three weeks ago

Devices larger that cellphones are subject to extra security checks

(CNN) Passengers on flights from Mexico to the United States can expect longer security checks starting Wednesday -- part of a larger US push for extra scrutiny for inbound flights worldwide.

Airlines in Mexico will now subject passengers on direct US-bound flights to extra security checks for portable electronic devices larger than a phone, Mexico's civil aviation authority said.

This comes three weeks after US Homeland Security Secretary John Kelly said his country would soon require all US-bound flights to implement the checks

Passengers planning to travel into the United States should "show up at the airport three hours before departure to comply with the procedures," Mexico's civil aviation authority said Tuesday.

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