Fedex has warned investors that profits will be weaker than expected - for the second time in three months.
The delivery giant blamed a sharp slowdown in international trade for the profit warning.
In addition, the launch of a six-days-per-week operation in the US, created additional costs.
FedEx has also been struggling to integrate TNT Express, which it bought in 2016.
The company reported that third quarter profits fell to $797m, from $1bn in the same period of last year.