The timetables above are designed to give pilots an approximate idea of where and when to expect controllers and pilots online. This information is intended as a general guideline; controllers will often sign in without advance warning. Controller availability may change with little to no advance notice. Furthermore, even if there is no controller signed-up, drop-in ATC is often available during our peak hours.
During ZBW events, indicated with a yellow background on the ATC Timetable, pilots can expect full ATC coverage at the event airports. The ATC Timetable does not always display ATC availability during official events.
Controllers will specify whether or not they are actively training or are scheduled for an over-the-shoulder competency examination. You may wish support this controller's attempt at achieving certification by flying within controlled airspace.
If no end time is specified, the controller is planning to stay online indefinitely.