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US officials are pressing airlines to collect and share more data on international travelers while federal health officials combat the coronavirus, two officials tell CNN.

The data request includes contact information that would help health officials follow up with potential carriers of the coronavirus, or fellow travelers who may have come into contact with an infected person.

The request itself is outlined in an interim final rule the CDC and Department of Health and Human Services issued in mid-February. It requests airlines provide, within 24 hours of a CDC request, each passenger’s name, “address while in the United States,” email address, and both a primary and secondary phone number.

The only issue is that many air carriers don’t currently collect some of the contact details the CDC is requesting, according to an industry official who spoke on the condition of anonymity.

Bookings made through a third party search engine, for example, may include highly limited information about a passenger.