It is hard, and lonely, for both of you. Many marriages don't survive it. So you need to be proactive.
You need to sit down and have a discussion. He has to understand that the reality is that you will now be the primary parent, so you will be making most of the decisions as they require, and he doesn't get to be pissed off about that. He also doesn't get to storm in and disrupt the pattern that you have established because this ONE Saturday he happens to be there - football, swimming, etc, will usually continue (for example).
But, you also need to acknowledge that travelling is hard, that he will get lonely, and will want special family time when he does come home. And, in all honesty, he will want a bit of a fuss made of him, because he will want to know that he has been missed. And that's fair. You are his family, and he is supposed to be loved by you and missed by you. He will miss out on lots.
So you have to plan on how to deal with it.
Discuss the big things for the DC, potential schools, subject choices etc, well in advance. So there is time to make the decision jointly.
Acknowledge that the smaller choices - clubs, extra-curricular activities, are predominantly your choice, given that you have to do the legwork with them.
Be flexible - missing one sporting fixture in the month if that's the only weekend day the DC's dad is around, might be the better option. But your DC might actually WANT their dad there, because it's rare. These things need a flexible and open approach.
It's easy to get into rigid routines, eg always watching a program on tv, that's what the record feature is for, some routines can and should go out the window when your DH comes home.
The travelling logistics - you're not his admin assistant or chauffeur - you do not drive him to and from the airport constantly. That takes a lot of time and effort, get yourself a decent car service to pick him up and take him.
Organise a laundry service for his business shirts/suits, and buy extra work shirts, suits, shoes etc. Don't spend the short time he is at home fretting about getting his clothing turned around in a short time frame. Spend the money on extras. You will BOTH be much happier for it.
MAKE TRAVEL LISTS - this is soo important - your DH needs to travel efficiently, and to do this he needs lists. So a list of what to pack and travel with. Toiletries in small containers - not all hotels will have nice things (depending on where he's travelling). Get extra toiletries in store for re-stocking in his turn around time. Make sure he travels with extra laces for shoes, a mini sewing kit, etc so he can do emergency repairs on the go. He should also have a card with all his size details printed on it in his wallet and backed up on his phone (in all countries' sizings, including shoes). If his luggage goes awol he can use it to order more clothes quickly.
Workwise he might also want to consider getting a mini printer/scanner for when he's on the go. He also needs to travel with sufficient stationery, and have decent office supplies at home, again so that he can restock before his next trip.
Think childcare logistics for yourself while he's away. For functionality purposes you might want to consider doing it as though you're a single parent. So school clubs, babysitters, perhaps even an au pair, to help you out. He does NOT get to veto these choices, because they are for YOU and are a direct result of his work travel.
Consider communication methods - do your DC have a way of chatting to their dad while he's travelling? Do they have mobile phones or tablets that they can keep in communication with him? A family WhatsApp group perhaps, so that everyone is kept in the loop? It will stop him feeling like an outsider.
Good luck.