... and maintain
Hi,
why use US ATCOs (and some others) the phrase e.g. "ABC123 climb and maintain FL270" whereas in other countries the ATCOs use (only) "ABC123 climb FL270"?
Is there any "history" of the phrase "... and maintain" ?
Omitting this "add-on" will save time regarding freq occupancy ... so what's the benefit of adding these two words - compared to the "condensed" version?
Regards,
Redfox
ATCO: "The number is 220 - either reduce to it or make it your heading"