Sometimes ATC gives instructions to pilot like following 1) climb to fl 380 by 2130z. 2) decent to fl 230 by kobok. Does the word "by" in the above sentences means "prior to, before" or "at, punctually"?
Sometimes ATC gives instructions to pilot like following 1) climb to fl 380 by 2130z. 2) decent to fl 230 by kobok. Does the word "by" in the above sentences means "prior to, before" or "at, punctually"?
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