In case a DL agent in Gulfport won't let you check-in for GPT-ATL-SEA-PEK, there's good news: The new design of the HK/Macao Home Return Permit, while still doesn't have its English name on the card, will have this sentence under the document number: "This card is intended for its holder to travel to the Mainland of China." The problems of (1) the lack of English on the HRP, as well as (2) the card number changing every time you renew/replace your card, will go away gradually within the next 10 years.