"Where is this aircraft coming from" questions; Times / aircraft don't make sense!
Jan 20, 2015, 3:00 pm
#76
Join Date: Jun 2011
Location: MEL
Programs: VAG
Posts: 1,865
Dammit! I followed the link here from the heading "Quantum Universe Theory" and was expecting something more interesting.
In answer to your question, the uncertainty principle in its time-energy form holds that:
Delta E * Delta T < hbar/2
Plugging this into Wolfram Alpha, it turns out that a 44 minute uncertainty in time corresponds to a certainty in energy on the order of 2e-38 Joules, which is rather small.
One can only assume that this implies United is really getting serious about saving money on fuel costs. (Or, y'know, they screwed up again.)
(IAAQP)
In answer to your question, the uncertainty principle in its time-energy form holds that:
Delta E * Delta T < hbar/2
Plugging this into Wolfram Alpha, it turns out that a 44 minute uncertainty in time corresponds to a certainty in energy on the order of 2e-38 Joules, which is rather small.
One can only assume that this implies United is really getting serious about saving money on fuel costs. (Or, y'know, they screwed up again.)
(IAAQP)
Jan 20, 2015, 4:10 pm
#77
Join Date: Jan 2000
Location: Spokane, WA, USA
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Posts: 554
Honestly, I don't know why UA even offers the feature. I really don't care where my aircraft is coming from, I just want to see it at the gate at the appointed boarding time. By offering the feature, UA simply provides more visibility into their own operational incompetence, and I'm frankly surprised it is still offered.
Certainly planes could be swapped but it usually doesn't happen where I fly. I find the app very accurate.
Apr 6, 2015, 7:44 pm
#80
Join Date: May 2001
Location: San Francisco/Bangkok
Programs: Alaska 75K United 1K
Posts: 1,409
Inbound on time but arriving after Scheduled flight
I am on 1517/6Apr 910p dep IAH SFO
the inbound is on time 1231/6apr LAX IAH but arriving after the
actual scheduled time of 1517's departure 940p
Trying to figure out if this is a UA screwup that a
scheduled arrival is after the same planes scheduled departure?
the inbound is on time 1231/6apr LAX IAH but arriving after the
actual scheduled time of 1517's departure 940p
Trying to figure out if this is a UA screwup that a
scheduled arrival is after the same planes scheduled departure?
Apr 6, 2015, 7:47 pm
#82
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As far as "how did this happen" it was probably an aircraft swap, since the inbound aircraft is actually showing arrival 2 minutes early.
Apr 6, 2015, 7:52 pm
#83
Join Date: May 2001
Location: San Francisco/Bangkok
Programs: Alaska 75K United 1K
Posts: 1,409
The delay just posted (65 mins). UA is often slow to acknowledge these. In these situations, it's often a creeping delay, too. My guess is you're looking at 2 hours.
As far as "how did this happen" it was probably an aircraft swap, since the inbound aircraft was actually 2 minutes early.
As far as "how did this happen" it was probably an aircraft swap, since the inbound aircraft was actually 2 minutes early.
Last edited by boycruz; Apr 6, 2015 at 7:52 pm Reason: none
Apr 6, 2015, 8:01 pm
#84
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Apr 6, 2015, 8:23 pm
#85
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May 4, 2015, 12:12 pm
#88
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Where is this plane coming from?
This info can change constantly. Sometimes, I think this is too much information for a lot of folks.
Operations constantly makes changes with which specific aircraft run which specific flights to optimize across the network. What likely happened thus far is that the plane originally scheduled to turn for your flight had something happen - severely delayed, went MX, etc, and they subbed the best alternative they have at this moment. As already mentioned - they will either do another swap as they can find something, or 1433 will be delayed.
Operations constantly makes changes with which specific aircraft run which specific flights to optimize across the network. What likely happened thus far is that the plane originally scheduled to turn for your flight had something happen - severely delayed, went MX, etc, and they subbed the best alternative they have at this moment. As already mentioned - they will either do another swap as they can find something, or 1433 will be delayed.
May 4, 2015, 12:18 pm
#89
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It's a fun, but relatively useless feature. The aircraft which makes up your flight could be:
1. Delayed and therefore your flight will be delayed;
2. Another aircraft may be substituted and you will depart ontime or close to;
3. The inbound could make up time.
Your flight has likely been flagged by Ops for a decision and that us likely underway.
1. Delayed and therefore your flight will be delayed;
2. Another aircraft may be substituted and you will depart ontime or close to;
3. The inbound could make up time.
Your flight has likely been flagged by Ops for a decision and that us likely underway.
May 4, 2015, 12:24 pm
#90
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ccur. It may not give us all available relevant information but it absolutely provides useful data points.