请问这句英语是什么意思？

亲，你是否应放些上下文呢？

This needs to happen in YOUR Friday AM WITHOUT DELAY.  We asked for these parts a week ago.  We understand the airing is expensive for you, and we only ask our suppliers when this is an absolute necessity.

We need to he tracking info for an EXPEDITE (NOT back to back) air shipment of these in our mailboxes for our Fri AM.

这个必须在你们的时间周五上午前完成，不得有任何的延迟！我们在一个星期前都要求了，我们可以理解空运费对于你们来说很贵，但是对于我们的商这一点是必须要求的。

我们必须尽快到货物空运的运送信息，以我们的时间周五上午为准， 发到我们的邮箱。
（我觉得客户这里的意思是需要飞机直达出货，不要转来转去back to back）

仅供参考

This needs to happen in YOUR Friday AM WITHOUT DELAY.  We asked for these parts a week ago.  We understand the airing is expensive for you, and we only ask our suppliers when this is an absolute necessity.

We need to he tracking info for an EXPEDITE (NOT back to back) air shipment of these in our mailboxes for our Fri AM.

我们在周五上午之前需要拿到航空速运的物流信息。 建议放上下文参考一下，

我们在周五上午之前需要拿到航空速运的物流信息。
back to back 不太理解