TUI, I believe. From the TUI website:
TUI brand
Touristik Union International (TUI) was created in 1968 by the merger of the leading tour operators Touropa, Scharnow-Reisen, Hummel Reise and Dr. Tigges-Fahrten. Other major tour operators were added in subsequent years, e.g. Airtours in 1970. The wide spectrum of diverse brands dominated the company for over two decades until TUI Group was introduced as the master brand for the tour operator brands in 1990. The unsupported level of awareness of TUI rose within less than 10 years from around 30 per cent to 89 per cent. The successful expansion in the European source markets of Germany, the Netherlands, Belgium, Austria, Switzerland and Poland, as well as in the destination countries, made TUI synonymous with quality holidays. Preussag acquired the market leader in 1998.
PP
[ 21 December 2001: Message edited by: Pilot Pete ]</p>