Air Berlin in talks to merge leisure airline unit with TUIfly | Reuters
File:D-ABMU Air Berlin Boeing 737-86J(WL) operated by TUIFly @ Düsseldorf - Rhein-Ruhr International (DUS - EDDL) - 21.07.2016 (28190037680).jpg - Wikimedia Commons
TUIfly (Germany) Flights and Reviews (with photos) - Tripadvisor
Seeing More European Airline Failures, TUI Beefs Up Fleet - Bloomberg