What does the mother say?
The way this is worded, it seems to be more as a protection against the possibility of transfers during flights more than anything else, and how the costs are divided. If costs of the one-way ticket are reasonable, and you are not billing 1/2 the cost of your vacation travel to the mother, I would think she would agree.
Parents can agree on changes outside the specific orders. There is no way to account for all changes and circumstances and the court merely does the best it can to lay a solid foundation.
There should be flexibility and co-parenting to meet the best interests of the child.
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I can't tell by your question if you are the mother or father, and whether the children live in DC or KC, and with which parent they live. Regardless, I don't think it matters.
The order says "shall", but I think that is referring to non-stop flights as opposed to ones that might require changing planes. I don't see where this clause requires any particular mode of transportation over another.
With that said, any extra costs associated with a one-way ticket, rather than a round trip ticker, should be paid entirely by whomever is seeking to drive the second leg. The mother should not be required to pay more for the one-way ticket than she would pay for the round-trip, and she should expect 50% reimbursement for what would be the round-trip fare.
If on the other hand, the one-way is cheaper, I don't see the downside to either party. I don't think the mother would be entitled to any more that 50% of that lower rate; but if she is the one giving you a hard time, you may consider reimbursing her the 50% of what would be the round-trip fare in order to encourage her to cooperate.
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Well its always best to obtain the other partys approval on any modification. You should be fine, if you are not taking any visitation time away from the other parent. If this were to be more regular, you can amend the order.