Yup, sure is. In the top 10 size wise in Europe and if we combine our US and ME operation, the world's largest airline.
As for happiness. I personally am pretty happy with my job. I have a great team of fleet managers looking out for us and the operational office does a pretty good job. Our colleagues are great too.
What do they do right? Well, they back you up with advice when required and will lean on the Schedulers when necessary too. Essentially, effective communication. Our engineers in City and Northolt are fantastic. The engineers we use in Luton and Southampton are excellent as well. Happy to explain stuff.