Navistar International has said its first-quarter worldwide shipments were flat, as growth in non-traditional vehicle markets offset a 6% drop in North American commercial truck and school bus shipments.

Navistar said it shipped a total of 27,500 vehicles, down less than a% from the 27,600 units in the same quarter of 2006, according to The Associated Press (AP). Non-traditional shipments rose 24% to 7,500 units from 6,000 in the year-ago period.

Non-traditional shipments include military vehicles sold overseas as well as other export sales, small bus, Class 4-5 vehicles and stripped chassis for the motor home and step-van markets, Navistar reportedly said.

North American shipments of schools buses, Class 6-7 medium truck and Class 8 heavy trucks totaled 22,400 units, down 6.4% from the 24,000 units in the first quarter of 2006, according to the report.

Navistar shipped a total of 104,000 diesel engines during the quarter, down from 123,100 units a year earlier. Shipments of diesel engines to Ford fell by nearly 19,000 units, Navistar reportedly said.

According to the Associated Press, Navistar said it expects its sales of non-traditional vehicles in fiscal 2007 to range between 35,000 units to 40,000 units, representing a gain of 20% to 26% over fiscal 2006 sales.