Flight Watch is the process of operations control which allows continuous monitoring and communication. The flights are monitored from takeoff to landing phase. For the effective completion of an en route flight, active monitoring is required to reduce any mishaps. This is important, especially during unforeseen circumstances, where the aircraft needs assistance for new route, additional ground support, etc.
The effective monitoring helps to inform about the changes such as landing at an alternative destination. The best way to achieve proper flight watch is carrying two-way voice communications directly with an aircraft crew.