The Airport extension enhances DuckDB by adding Arrow Flight support, allowing for efficient querying and data management via Arrow Flight servers. Instructions for cloning the repository, building the extension, and running tests are provided, along with notes on dependencies and setup requirements.

DuckDB GSheets is an experimental extension that allows users to read and write Google Sheets using SQL commands. It supports authentication through various methods, including access tokens and private keys, enabling seamless integration between DuckDB and Google Sheets. The extension is community-maintained and comes with specific usage guidelines and limitations.