Yes. It is possible! You can upload tracks with your preferred FTP software. FTP is also known as File Transfer Protocol and it is a way to upload large batched of tracks into your Airtime library.
Note that you can only upload, you cannot manage or download files using FTP. We recommend that you ensure that all of your tracks have correct metadata before uploading them via FTP. Additionally, you can only use FTP and not SFTP.
Authorised users can find the FTP connection information by selecting Help > FTP Upload from the Airtime menu.