Cost savings?
Had a trip to Belgrade for a project with flight home suggested for me on (very expensive) Friday lunchtime
I requested that they book my flight to Sunday so I could spend the weekend there and, of course pay for my own accommodation (in a better place than the flea-pit they had booked for me)! The Sunday flight was at least half the price of the Friday one!
Nope, not possible! Why? Because the Friday lunchtime flight meant that I would still be able to 'get to the office' before my official end of day time of 5:30! Even IF everything went to plan I reckoned the best I could do would be just after 5!
Flight was delayed by 2 hours, made a point of going to the office anyway, signed in/out at 7:30pm. Charged them 2 hours overtime!