Lufthansa is one of Europe's largest airline groups operating major global hubs in Frankfurt and Munich. If your Lufthansa flight was delayed by 3+ hours or cancelled, you are protected under EU261.
Lufthansa generally maintains an online portal for compensation claims. However, operational delays, crew scheduling errors, and technical faults are frequently rejected initially under blanket 'extraordinary circumstances' notices.
Under European law, technical maintenance issues and airline employee strikes (including Lufthansa pilot or cabin crew strikes) ARE eligible for full compensation. Only external air traffic control strikes or severe weather exempt Lufthansa from paying.