Question: Are Hydaburg Seaplane Base and Alexandroupoli Airport both located in the same country?
Sentence (from "Scotts Seaplane Base"): Although most U.S. airports use the same three-letter location identifier for the FAA and IATA, Scotts Seaplane Base is assigned CDD by the FAA but has no designation from the IATA (which assigned CDD to Cauquira, Honduras).
Relevant evidence: No