If you are a UAS operator registered in an EU member state outside Austria and intend to conduct a UAS flight within the "Specific" category (Article 5 of Regulation (EU) 2019/947) that takes place partially or entirely in Austria, you must obtain an authorization under Article 13 of Regulation (EU) 2019/947:
To proceed, first contact your national aviation authority to submit the required declaration (for STS) or obtain an operational authorization. Once you have received the necessary documents, you can apply for a cross-border operation in Austria under Article 13 VO (EU) 2019/947.
Ways to Apply for an Operational Authorization Under Article 13 of Regulation (EU) 2019/947: