| Their job is to keep track of aircraft while they are en route or during the high-altitude cruise phase of their flights. |
| To keep track of them all, Crewdson offers an all too necessary list of dramatis personae at the end of the book. |
| Trying to keep track of 18 people rapidly debasing themselves in the hope of winning a million dollars was no easy feat. |
| A Gantt chart like this can be used to keep track of progress for each activity and how the costs are running. |
| The Geminian influence may make it difficult to keep track of where your man's going. |
| But officials admit they cannot keep track of how much is exported, as few are willing to pay export taxes or declare their income. |
