Airbalticfan From United States of America, joined May 2008, 279 posts, RR: 1 Posted (7 years 10 months 2 weeks 6 days 15 hours ago) and read 4487 times:
Hey there,as I am a greenhorn in aviation,my question might sound dumb....
What is the main reason for the plane to fly far away off from flight plan?
I was watching the Frontier flight which was off by approx. 200 miles even with weather being perfect for flights!
Tb727 From United States of America, joined Jun 2005, 2046 posts, RR: 12
Reply 2, posted (7 years 10 months 2 weeks 6 days 14 hours ago) and read 4425 times:
Yeah, I'd have to see the specific flight. Generally though flight plans are changed daily depending on where the jet stream is to stay in/out of it depending on tail or headwind. Widespread areas of bad turbulence may also be planned around as well.
Over the winter you will see some crazy stuff on East Coast-West Coast flights avoiding the core of the jet stream, which could mean upwards of 150 knot headwinds, flights are planned to go way up over southern Canada.
OPNLguy From , joined Dec 1969, posts, RR:
Reply 4, posted (7 years 10 months 2 weeks 5 days 13 hours ago) and read 4204 times:
First, "deviate" is what one does with respect to one's filed flight plan, i.e. "We deviated 50nm north of our filed route to get around the weather." "Divert" is what happens when one flies from AAA to BBB, and weather or operational issues preclude a landing at BBB so you divert to the alternate CCC, and re-try CCC-BBB later once things have improved.
As others have said, the exact flight number or city-pair would need to be know so we can see what you're talking about. Also keep in mind that weather isn't only consideration, since ATC commonly has re-routes issued to optimize the traffic through (or to) an impacted area.
Pilotpip From United States of America, joined Sep 2003, 3172 posts, RR: 9
Reply 5, posted (7 years 10 months 2 weeks 5 days 13 hours ago) and read 4197 times:
Airways are not used as often as they used to be because of RNAV. They're still used quite heavily on the east coast but more often than not we're getting very direct routes with a few fixes in each center to keep controllers happy.
Also many flight plans we used are a standard flight plan that is always filed by dispatch. When it's busy it makes sense to use airways and a ton of waypoints to keep everything flowing smoothly but at 11pm it's not unusual to get cleared direct to a waypoint 500nm downrange which saves us a lot of time and fuel.
411A From United States of America, joined Nov 2001, 1826 posts, RR: 8
Reply 6, posted (7 years 10 months 2 weeks 5 days 12 hours ago) and read 4187 times:
Well....sometimes, with international flying, overflight clearances have not been properly received/approved.
Last January, enroute JED-OUA, Sudan had not recived our filed overflight request, so denied FIR entry.
What to do?
The First Officer asked the KRT controller to negotiate overfligt via Egypt/Libya, bypassing the Sudan FIR.
Clearance received from Egypt/Libya via landline, and as we had uplifed sufficient fuel from JED, changed course, and proceeded via the new clearance.
Additional flight time, 42 minutes.
Passengers pleased, company pleased...First Officer received an increased bonus at the end of the contract.
All in a days work.
This flight is not "way off from flight plan". It might not be a straight line between IAH and DEN, but that's quite understandable given the thunderstorms, which, BTW, the CO dispatcher has intentionally planned them around. The filed route was JCT5 JCT J15 CME CIM ALS LARKS5 which takes them over Junction (JCT), Chisum (CME, a navaid near Roswell NM), and then Cimarron (CIM, a navaid in NM) and Alamosa (CO) a navaid in Colorado. Now only was this the filed route, it looks like that's exactly the route they flew.
Goldenshield From United States of America, joined Jan 2001, 6170 posts, RR: 13
Reply 11, posted (7 years 10 months 2 weeks 4 days 23 hours ago) and read 4081 times:
Quoting OPNLguy (Reply 9): It might not be a straight line between IAH and DEN, but that's quite understandable given the thunderstorms, which, BTW, the CO dispatcher has intentionally planned them around.
It also could have been published in an ATC reroute advisory.