Sponsor Message:
Civil Aviation Forum
My Starred Topics | Profile | New Topic | Forum Index | Help | Search 
Airlines Definition Of On-time In Various Places?  
User currently offlinesankaps From United States of America, joined Jan 2008, 2255 posts, RR: 2
Posted (2 years 9 months 2 weeks 3 days 8 hours ago) and read 5431 times:

Hi all,

Can anyone tel me definitively how on-time performance is defined by airlines in the US, UK, Germany, Singapore, UAE, Japan, India, China, etc? Is there a standard definition? Are delays due to weather, ATC, etc excluded? Are cancelled flights excluded?

Essentiall, is there a gobally accepted standard definition?

Thanks,

Sankaps.

4 replies: All unread, jump to last
 
User currently offlineboeing773W From South Africa, joined Mar 2012, 47 posts, RR: 0
Reply 1, posted (2 years 9 months 2 weeks 3 days 6 hours ago) and read 5342 times:

I don't have a source for this and cannot say for sure that it applies equally in every country, but I seem to recall that a flight which operates within 15 minutes of its schedule is considered "on time"- i.e. within 15 minutes before or after. A flight over 15 minutes late is considered "delayed" and under 15 minutes "early".

It would be interesting to get other people's responses, perhaps with some authority.


User currently offlinerdh3e From United States of America, joined Mar 2011, 1827 posts, RR: 3
Reply 2, posted (2 years 9 months 2 weeks 3 days 3 hours ago) and read 5239 times:

Quoting boeing773W (Reply 1):
I don't have a source for this and cannot say for sure that it applies equally in every country, but I seem to recall that a flight which operates within 15 minutes of its schedule is considered "on time"- i.e. within 15 minutes before or after. A flight over 15 minutes late is considered "delayed" and under 15 minutes "early".

It would be interesting to get other people's responses, perhaps with some authority.

The standard for departure is D:00. So departing by the time the flight is scheduled to leave, some measure that by when you kick the brakes, some by when you move the aircraft.

The real standard for on time though at least in the US is A:14, arrival within 14 minutes of scheduled arrival time.

[Edited 2012-03-13 11:29:44]

User currently offlineRoseflyer From United States of America, joined Feb 2004, 9826 posts, RR: 52
Reply 3, posted (2 years 9 months 2 weeks 3 days 3 hours ago) and read 5193 times:

When I was working reviewing reliability numbers at an airline, there were 5 numbers that we used.

A14: Arrival within 15 minutes of scheduled arrival time for all flights.
D0: Airplane parking brake is released at departure time, which is filtered to remove weather, airport operations, passenger loading, catering, etc
D15: Airplane is within 15 minutes of scheduled departure time (filtered as above)
D120: Airplane is within 120 minutes of scheduled departure time (filtered as above)
Cancellations: Canceled for airplane maintenance and mechanical reasons including crew time out due to airplane maintenance, but not weather or lack of crew availability

The reason for so many metrics is that each of them is evaluated for different reasons.

The metric reported to the public is A14 and shows the overall health of the airline. This metric can be used to measure performance of all divisions from crew operations to maintenance to dispatch. It also shows delays caused by cascading problems in the schedule. Padding the schedule helps this number, but padding the schedule comes at the cost of paying higher crew rates and lower fleet utilization.

D0 is the goal from an aircraft availability point. The airplane is ready to fly with no mechanical problems. Airport operations delays can happen, but the airplane should be ready to go.

D15 is important because items causing mechanical delays less than 15 minutes are understandable. They typically are for deferring a part or cycling power quickly to a system. They do not require intensive maintenance and show that the airline is healthy at addressing a maintenance problem from the second the plane blocks into the gate rather than waiting until departure is imminent.

D120 is useful because it shows overall how reliable are the airplanes. Poorer reliability can be fixed by improving maintenance programs. D120 are delays that usually result from a genuine mechanical problem and not about simple deferral items.

Cancellations are about maintenance but also spares availability, dispatch's ability to swap airplanes and crew, etc.



If you have never designed an airplane part before, let the real designers do the work!
User currently offlinezippyjet From United States of America, joined Sep 2001, 5555 posts, RR: 13
Reply 4, posted (2 years 9 months 2 weeks 3 days ago) and read 5092 times:

With us, if it says departure at 1915, it's 1915; wheels rolling (off the gate). All passengers have to be on board no later than 10 minutes prior to published departure time. If we are late (CSA/Ramp/In Flight) you better come up with the reason and document.
Enough times late and there's a secret room    kidding on the secret room. From a Department of transportation standpoint (DOT) delays more than 15 minutes are considered major delays and count against the carrier involved.



I'm Zippyjet & I approve of this message!
Top Of Page
Forum Index

This topic is archived and can not be replied to any more.

Printer friendly format

Similar topics:More similar topics...
Did UK Airlines Know Of Terror Raids In Advance? posted Sun Aug 13 2006 23:32:33 by Nighthawk
Airlines- Always Never On Time! posted Sun Sep 26 1999 06:09:51 by Mish1234
Aloha Airlines #2 In On-Time Service......WOW posted Fri Jul 7 2006 03:12:06 by Socal
On Time Performance Of European Airlines. posted Thu May 19 2005 12:28:09 by Jorge1812
On-time Performance Of European Airlines? posted Fri Jan 16 2004 01:41:11 by EZYcrew
The Losingest US Airlines Are Top In On-Time posted Fri Sep 6 2002 17:29:53 by UA744Flagship
Hainan Airlines Pull Out Of South Asia In A Rush posted Sun Oct 9 2011 19:08:04 by 777way
Southwest Last In On-time Arrivals. posted Thu Jan 6 2011 15:15:16 by tozairport
US Airways #1 In On-Time, Baggage & Satisfaction posted Thu Jul 8 2010 13:41:07 by StarAlliance38
UA Website Touts Top On-Time Ahead Of DL, AA, CO! posted Fri Mar 12 2010 16:33:14 by 777fan