It’s not just BAE Systems that use these flights, other related companies with interests in BAE etc can book a seat, like QinetiQ, MOD, DSTL, Thales... it is very feasible that 50 people a day might need to travel around 4 or 5 major sites who in total employ over 35000. And if you consider the other organisations eligible to use the service, you are looking at over 90000 employees. That is 0.05% travel rate??

Also you can’t have design assessments and inspections from the designers across Skype or a telephone when you need to see the physical object.

Also you have to remember the top secret nature of these meetings. They must be delivered through very secure mediums if done remotely and this is difficult and expensive. UK and other national security is at stake.