[2] North American sister companies are Stock Transportation in Canada and Petermann Bus in Ohio.

[4] On November 21, 2016, a school bus operated by Durham was involved in an accident which left six students dead in Chattanooga, Tennessee.

The investigation revealed that though the driver was not intoxicated, he was speeding and had strayed from the assigned route.

[5] Walker had been involved in an accident two months prior, and had his drivers license suspended in 2014 for failure to show proof of insurance.

[8] On October 16, 2018, a Durham School bus was on its way to Valley Ranch Elementary in Irving Texas shortly before 7 a.m. when the driver noticed smoke coming from the engine, according to Coppell ISD spokeswoman Amanda Simpson.