What does the phrase "10 and trail" or maybe it's "10 in trail". Does that mean that aircraft A is 10 miles behind Aircraft B? im working on my private license (about half way done), and in the process I don't hear this particular phrase where I fly. I do however hear it when i listen on LiveATC for example. Can someone give me some info/ insight?! Thanks,Mitch Bowman

http://www.nianet.org/Publications/Technical-Reports/pdfs/2007/2007-06tmp-r1.aspx Quote<The In-Trail Procedure (ITP) algorithm is an airborne software module of the AirborneTraffic Situational Awareness – In-Trail Procedure (ATSA-ITP) application in non-radarairspace. This software module is responsible for computing the flight deck informationneeded by the crew to determine whether the criteria required for an ITP procedure are metor not. This information is processed by a host application that decides how and when it isdisplayed to the crew.>unquote This explains the lot. Just a Google search...... Peter AertssenAmsterdam

but what does it mean? lol

"10 in trail" means separation between aircraft is 10 miles.