I guess as they've gone bust I can tell this story now ... I used to consult for Thomas Cook about 15 years ago, and they were a basketcase of a company even back them, so this doesn't surprise me. I feel sorry for all the reps and workers out in the field and on the planes who will lose their jobs because of the profligacy of the Peterborough head office.
Two examples of stupidity stick with me. One was that at the time they outsourced their website to their main competitor. Which as you can imagine worked well because their competitor had no desire at all to fix the many problems with the website. TC didn't understand that the website was everything because they were at heart a high street travel agency.
The other was when I worked on managing their AdWords account, which was enormous (like 100K different keywords in thousands of groups). Some keywords would be bid at £10s of pounds. It is very easy to lose a lot of money on these keywords because there's a fine balance between the profit you make on each holiday (usually £100-ish), versus paying a large amount of money on each keyword and the number of sales you make at the end of the "sales tunnel". There was also a weekly industry survey which came out ranking the position of all the travel websites according to number of visitors (I forget the name of it). Senior managers at TC were fascinated by "being number one" on this survey every week, and so would instruct us to dial up the keyword bids on Friday night and run like this over the weekend. Google AdWords with high bids is very effective at bringing large numbers of low quality visitors to the website.
Each week they would indeed come number one on this survey (read only by other senior managers in the travel industry), while at the same time losing tens of thousands of pounds selling holidays for negative profit.