It means "standard."
ATA = Actual Time ArrivalSTD =StandardTime Departure ATD = Actual Time Departure
Well I am pretty sure that there is a comparison chart for condoms. I mean u would want to know as a man or women which brand is better to use correct. You want something that will prevent you from getting STD'S and so on. Unfortunately it doesn't protect a 100% against STD'S. So it is better to be safe then sorry.
ETD is the Estimated Time of Departure, and ETA is the Estimated Time of Arrival.
If by plane chart, you mean schedule, then X67 represents the frequency of flight operation - in this case, daily except Saturday and Sunday - a value of X2 would represent daily except Tuesday, etc.
Having fatigue doesn't mean you have a STD.
std means sexually transmitted disease.
yes what is a chart recorder
Flight service stations
What does a dotted line on an organizational chart mean
Sexual transmitted diseases
are you for real? of course not!! (although if you never pee again after having sex once then that is a problem but it doesnt mean you have an std!)
std means standard call and idd means international direct dial