"This is an incremental negative for FDX and UPS as it will likely remove some higher yielding express freight and parcel volume from each of the respective networks," RBC Capital Markets analyst John Barnes said.
Meanwhile, American global courier delivery services company FedEx said the announcement was not a surprise and called Amazon a valuable customer.
"We work closely with Amazon and have been aware for some time about their need for supplemental air capacity related to inventory management," said Patrick Fitzgerald, senior vice president of integrated marketing and communications at FedEx.
Read more from our special coverage on "AMAZON"
Headquartered in Seattle, Washington, Amazon is the largest Internet-based retailer in the United States. The company started as an online bookstore, later diversifying to sell DVDs, Blu-rays, CDs.
The company also produces consumer electronics-notably, Amazon Kindle e-book readers, Fire tablets, Fire TV and Fire Phone-and is the world's largest provider of cloud infrastructure services.

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