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Thread: Is there a way to access a receipt from an already flown flight?
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Old Apr 6, 2016 | 10:17 pm
  #14  
nrr
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PNRs: 6 ALPHA characters, hence 26^6 = 308,915,776
Ticket #, 10 numbers (after 001) = 10^10 = 10,000,000,000 (10 Billion)

With 2016 computer technology and super fast search capabilities, why have two different systems associated with a reservation? [Admittedly, remembering 6 characters is nicer than 10 digits], adding one more character to a PNR, would allow 26^7 = 8,031,810,176 (8 Billion).
Didn't USAir, use numbers and letters for their PNRs?

^ is the exponent symbol
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