Hello there,

How do airlines have a quite accurate significant ETA? I mean what are the involving calculations?

In simulation I usually divide the TA/Distance in NM, then add ( I think ) from E-W= -20 minutes( including descend ), and W-E= +20 minutes ( including descend ) of wind, which is not very accurate. Say I was flying an A342 from; FAO-GRU. 4220NM distance, and a speed of around 498 TA. That would conclude on 8:47389...(average of 8:50) as it is a E-W flight SO; -20 minutes would have a total of 8:30 hours.

I tried that myself, and well I got there 25 minutes early. Of course tail wind might of happened, but How are airlines so accurate with their times?

The example I gave is for FS, but I thought that real flight would not have a big difference.

What is the actual calculation?

Cheers

Lucca M.