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We need to list dates of past travel for some immigration purposes. I have a stack of boarding passes which I can use to reconstruct most of it. However, most passes don't show a year. They just show day and month.
Is there a way to find the year? Perhaps from the ticket number? Conformation number. Bar code?
I had the same issue... Go on each airline's website, and check the 'status' of your booking (from the six character booking code on the boarding pass); the details page works for most airlines many years back, and will show you the year.
I've been in this situation as well. Luckily, most of my bookings were online, and I kept the emails. But this didn't work for all my flights.
The other comments and answers contain good hints for various ways to reconstruct the dates. But when all else fails, the best way is to email the airline's customer service department (I think even United has one of those) with the ticket numbers (not the 6-character booking reference) and request they send you ticket details.
I've often wondered why the airlines can't print a year with the month, day on the BPs. I think it's ridiculous to not include a year.
Indirect sources other than confirmation emails may be:
Responding to "Perhaps from the ticket number?"
If the boarding pass has the ticket number on it, then as Doc mentions in comments, these are issued sequentially and can possibly be used to determine the rough date, however it requires a little research. Although BA boarding passes don't have ticket numbers on them (apart from mobile ones), they're the ones I have most of so I used those.
I took a sample of about 15 ticket numbers together with the issue date and plugged into a spreadsheet. I divided the difference in ticket number by the difference in days between two tickets. Over the last two years the average increment in ticket number per day ranged from 37000 to 44000. That would be more than sufficient to determine the right year for a given ticket number given one reference ticket with known date. You would need to perform a similar test for the airlines you have BPs for.
You can look at the barcode boarding pass standard here. There doesn't appear to be any other useful field that would indicate the year. This is somewhat surprising following the update of the standard to incorporate digital signatures, as that means that a boarding pass issued one year, will pass the digital signature test on the same day every subsequent year.
