1.   Almost every year for two decades, its strikes have halted classes for weeks on end.

2.   A strike would halt most public transit in the city and the other two transportation unions would likely respect the picket lines.

3.   A strike would have halted some output at Ford, also.

4.   A strike could have halted some GM production within days, analysts said at the time.

5.   The strike has halted production of Chevrolet Lumina and Buick Regal cars, full-size extended cab pickup trucks, and several other car models made in Canada.

6.   The strike could halt production at some GM car and truck assembly plants as early as this week, analysts said.

7.   The strike halted trading on the exchange yesterday.

8.   The strike halts, however, services such as directory assistance and installations.

9.   The strike has halted assembly of more than two dozen models of cars and light trucks.

10.   The strike has halted production of GM cars and trucks in the U.S. and Canada.