Can I buy a plane ticket with my sister's ID card?

You can apply for temporary boarding certificate.

If passengers forget or lose their ID cards, they can hold expired ID cards, driver's licenses, household registration books and other relevant documents that can prove their identity, and go to the police office of the terminal to apply for temporary flight certificates.

The validity period of the temporary flight permit is usually 7 days, and it can be extended to 15 days in special circumstances, and the fee is charged according to the provisions of the price department. The temporary flight permit is also paper, and it is only valid when flying.

"Opinions on Establishing the System of Receiving and Reissuing the Loss of Resident Identity Cards in Different Places"

8. Provide temporary identification service. For those who need to board the plane, take the train or stay in the hotel urgently because of the loss, theft, forgetting to bring their resident ID cards, the airport, railway station police station and police station under the jurisdiction of the hotel will issue temporary identification certificates in time by inquiring the identity of the personnel approved by the national population information system for the next flight, train and stay in the hotel.