Companies that use a plus-delta model of understanding what customers love (the plus) and what they would improve (the delta) make improvements to their operations quickly and efficiently.

公司使用敏感性分析模型去了解消费者喜欢什么(用加号)和他们需要改进什么(用三角形)，这样可以更快更有效率的改进他们的运营。

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When the data has just been moved into that table, it contains in our scenario information that is no more than an hour old, plus a small delta corresponding to the time required to execute the step.

在本场景中，当数据刚刚被移到该表中时，它包含的信息要少于一个小时的，因为执行该步骤所需的时间导致了很小的时间差量。

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These are: International Airlines Group (BA and Iberia) plus American Airlines; United, including Continental, and Lufthansa and Air Canada; and Air France-KLM with Delta, incorporating Northwest.

它们是：国际航空集团（BA和伊比利亚）加上美国航空；联合航空，它包括大陆航空、德国汉莎和加拿大航空；法航-荷航与合并了西北航空的达美航空。

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After you have torn up its 120-plus runs, warm up in the Delta's heated outdoor pool with indoor entrance, three outdoor hot tubs and a sauna.

BBC: Daily deal: Canadian mountain lodge

Regular carriers, say analysts, should offer more "in-between choices, " like Delta's Economy Comfort or United's Economy Plus, with more legroom and other amenities for a few dollars extra.

CNN: 2022: Cheap flights, more rail and hands-free cars