Carriers' overall on-time and transit time reliability decreased in April as the great migration of vessels ensued amid launching of the mega ocean shipping alliances, 2M, OCEAN Alliance, and THE Alliance on April 1.

Namely, the on-time reliability in April decreased to 59% from 63% in March 2017, according to the latest data provided by intelligence provider CargoSmart.

During the six-month period, January experienced the lowest reliability of 56%, while November had the highest reliability of 70%.