Parenting Time when STBX travels

My stbx travels approximately 85-90% of the year for his job. I was recently hired for a really good job (after being out of the workforce for 8 years) and I start my orientation this week. I was expecting the stbx to be home this week, working locally, but he texted me yesterday that he'll have to return to the client site next week. When he got home last night (Friday) for the weekend, he said he would take our 13 y/o son with him on his trip (son is out of school this coming week). When I told him there's no way he could take our son on a business trip -- what is he supposed to do all day while stbx works 10 hour days? STBX's plan was "he could stay at the hotel and play video games, and so-and-so's girlfriend said she could take him to museums and stuff."

THEN he goes on to say that he'll be taking our son on business trips several times during the year because stbx is supposed to have our son for 6 weeks out of the year, but he only has 3 weeks of vacation per year. I was very cooperative and generous with the parenting time plan, giving stbx 3 weekends every month (vs. every other), and an extra week in the summer (4 weeks), as well as every other school break. I did this because I thought his plan was that he would arrange his schedule to work locally during those extra weeks -- not drag him along on a business trip to sit in a hotel room unsupervised, or be put in the hands of a random co-worker's girlfriend,wife, or god knows who else.

Would a court approve this? I know each parent can make their own childcare arrangements on their own time, but how could it be acceptable that a parent just put him in front of a video game in a hotel room, or with a stranger in a strange city? I'm not looking to make things difficult for stbx or alienate him from our son ... but I'm NOT comfortable or OK with any of this, especially when I would be home. My new job does not give me regular hours, but the upside is that I have major flexibility and can plan my workdays around the ex's parenting time, and be home 100% when our son is on my time.

OK ... I'm going to post and hope that all of my paragraph breaks go through this time, because I hate reading long, unending, unbroken texts. :-)