AirLST is a modular attendee management software designed for events, guests, and attendees. Its primary function is to handle the full lifecycle of event participation, from invitations and registration to on-site check-in and post-event analytics. The platform is built as a suite of modules that can be configured to meet the specific needs of an organization, whether for a single event or for integration into an existing corporate IT landscape. It is used by global corporations, public-sector organizations, and event agencies to manage attendee processes securely and efficiently. The software offers a range of capabilities, including customizable invitation websites that match corporate design, built-in artificial intelligence features, and a connected hub that links to other systems. Open APIs allow integration with CRM and marketing platforms such as Salesforce, HubSpot, and SAP. Each feature, from digital guest lists to ticketing and check-in, operates as a module on the same platform, sharing a single data set. The system also supports approval workflows, flags for public officials, and audit-proof documentation of attendance, which can be used for tax reporting under German tax law. Typical use cases include company-wide attendee management for large enterprises, such as Mercedes, which has used AirLST since 2020. The platform can be configured for various industries, including retail, lifestyle, industrial, pharmaceutical, consumer, entertainment, and the public sector. Custom development and integrations are available for cases not covered by standard modules. The system is designed to adapt to new requirements through configuration rather than new projects. Technical details include TISAX assessment for information security to automotive industry standards, ISO 27001 certification for data centers, SSL encryption for data transfer, and GDPR compliance. The software is hosted in Germany. Access and permissions controls allow full management of sensitive guest data, and analytics and reporting features provide insights into event performance.