IT. Not in sales or management or anything, just a techie. I travel all over Europe, the Middle East and Africa (well, just South Africa really) working on customer site, and occasional visits to our offices in the US and Europe for training. But mostly I'm going to work on customer site, either solo or as part of a small team.
The amount of travel has reduced MASSIVELY since COVID. In 2019 I flew 50 flight legs, this year I only flew 14 so far. This is because our customers have finally realised what we have been telling them for years, that we can work fine over VPNs and they save on expensive flights and hotels. BA have extended my frequent flyer status every year, clearly in desperation that I will start flying regularly again - sorry, not gonna happen.
I'm usually only away for 4 days, 5 max. I ALWAYS come home for the weekend, even from South Africa and I only ever fly on a Sunday evening if it's long haul - it's not a negotiable. When I was earlier in my career I would often be on customer site for several months at a time (coming home every weekend) but now I typically only might go for one week per month on longer term projects to help out more junior project team members.
It's not glamorous. Getting to Heathrow for 04:30 every Monday morning for weeks on end sucks. Yes, you get lounge access but the lounge it's packed in the morning - although I will admit it's nice to get to the airport early and chill out with a glass of wine or two on the homeward leg. Some customer locations are great, sometimes you will be stuck on an industrial estate 20km outside Kielce in February. It's not good for your health unless you are super disciplined and make sure you book a hotel with a good gym or safe places to run nearby and don't get tempted to eat crap and drink every night.
It needs a super-supportive partner and understanding family and it messes with your weekends as all the little jobs you would have done during the week have to be crammed into the weekend.
The pluses: sometimes you get a great project somewhere lovely. Spain and Italy are great obviously, but I would have never developed such a love for the Nordic countries, Germany, and Belgium (yes Belgium!) without being having worked there. Or such a deep loathing for Dubai. I love working on projects with our local teams, meeting up with colleagues who I normally only ever see on a webex is brilliant. Most of our customers are lovely and it's great to work in industries and sectors that I would usually never have any interaction with (or even knew existed!)