Bus Vannin has operated a Sunday timetable today and will do so again tomorrow, instead of the planned emergency TT schedule.
It's due to a shortage of stand-in drivers while Unite members continue their 12-day strike.
The disruption hit some school services this morning, with no bus available to take pupils from Ramsey to QEII high school.
The emergency TT timetable was published at the end of last week after a recruitment campaign to find non-union drivers holding a PPV or public passenger vehicle licence.
Head of Administrative Services at the Department of Education John Gill says today's school service proved patchy - despite the best efforts of the company to run buses:
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