博客围绕业务领域模型展开，探讨了行程、航段、航班、设备和座位的含义。以从A国经B国到C国的行程为例解释航段，认为设备指飞机，还对业务领域模型中航段和航班的一对一关系表示困惑。
1. What does itinerary, segment, flight, equiment and seat exactly mean in the Business Domain Model?
In my opinion, a segment is defined as one takeoff and one landing on an itinerary. For example, if you want to travel from country A to country C and there's stopoever at B (A->B->C), there'll be two segments included in the itinerary. But why a segment only has one flight in the model, I had thought there should be more than one flight for a segment?
The equiment is an airplane, I think.
But what confused me is that the segment and flight have the one to one relationship in the Business Domain Model?
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