I safely returned from Las Vegas, and I hope I can spend the rest of the year at home, so I can already take a look at my travel statistics.
There might be some incorrect entries for the odd time I had to reschedule a flight (for instance, when we had to fly from Seattle to Barcelona in 2015 and our flight over Amsterdam was rescheduled to a flight over London because there was a storm in Amsterdam; I also didn't fly to Singapore over Frankfurt, but we rescheduled to Munich), but otherwise the following overviews are more or less accurate:
As you can see, I am a heavy user of KLM (67 flights), followed by SN Brussels (18 flights), Delta (10 flights) and Air France (9 flights). In spite of the fact that I fly "Skyteam Elite" most of the times (KLM, Delta, Air France,...), I'll probably lose my Gold status at the end of the year, because I didn't reach the minimum number of airmiles / flights this year. That's a bummer, because I like Delta, Air France, and KLM (in that order) more than any other airline (well, except for Singapore Airlines, but I don't have to be in Singapore that often).
When you look at the Cities I use as traveling hub, Brussels is number 1 (59 times), followed by Amsterdam (35) and San Francisco (26).
New York, Seoul, Paris, Boston, Singapore, Berlin, Barcelona, Seattle, Bengaluru, and Las Vegas are the other cities with airports where I've been at least 4 times in the last 4 years.