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Amex Card Skymiles Bonus - why reported in 2 parts - no speculation please

Amex Card Skymiles Bonus - why reported in 2 parts - no speculation please

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Old Jul 30, 18, 9:05 pm
  #16  
 
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Here is a fact that may or may not affect you so I will not speculate on your case. Delta and Amex were limited at one point on the fact that miles were transfered and limited by the old "main frame" 8 byte numbers or was it 16 bytes with a sum error check? I am going to stop now because I am speculating.
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Old Jul 31, 18, 1:41 am
  #17  
 
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For years and years, this has been the dealio.

Delta runs IBM...
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Old Jul 31, 18, 8:19 am
  #18  
 
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What geek CALLS to check mileage transactions instead of logging in online or using the app?
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Old Jul 31, 18, 9:14 am
  #19  
 
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Originally Posted by BeantownFlyer View Post
What geek CALLS to check mileage transactions instead of logging in online or using the app?
I routinely fax in a request for my statement to be faxed back to me. I love the sound of my dot matrix printer spitting it out...
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Old Jul 31, 18, 10:43 am
  #20  
 
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I don't care if it gets me banned, fined, imprisoned, or executed - I'm gonna speculate!

A lot of airlines and banks are either running ancient computer systems, or are limited by rules that were in place in ancient computer systems due to old software that was written in accordance with their limitations. "Legacy systems".

If we're looking at a binary number, the maximum value it can hold is 2x where x is the number of binary digits (bits) we have to work with. If it's a signed number (i,e, can be positive or negative) you need a bit to hold the sign so it's max value is 2x-1.

Bits tend to get parceled out in bytes, or groups of 8 due to the way memory addressing works. 2 bytes, or 16 bits at a time would make sense.

So my speculative theory is that on either of the two parties sides, they're limited to working in 2 byte batches for Skymiles. And since they can probably both add or remove them they need a negative. That gives them a range of -32768 to 32768 they can work with at a time. As to why it's 28,000 and 32,000 and not 32,768 and 27,232 I'd bet that the latter pair just looks to weird.

I think we'd need an insider from one or both of the IT departments to know for sure though.
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Old Jul 31, 18, 10:49 am
  #21  
 
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Ah, I assumed 16 bits - 15 for digits and one for sign. But it could have been 15 for digits and a check bit - that would give a range of either -32,768 to 0 or 0 to 32,768
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Old Jul 31, 18, 3:05 pm
  #22  
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Originally Posted by smc333 View Post
Ah, I assumed ........
Never assume.........
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Old Jul 31, 18, 7:42 pm
  #23  
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Originally Posted by landgraf13 View Post
I routinely fax in a request for my statement to be faxed back to me. I love the sound of my dot matrix printer spitting it out...
Don't knock the dot! I still use the one I bought 20 years ago. Love the sound.
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Old Jul 31, 18, 9:22 pm
  #24  
 
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Originally Posted by smc333 View Post
I don't care if it gets me banned, fined, imprisoned, or executed - I'm gonna speculate!
What if speculation gets you stuck on a CR2 for all future flights?
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