Why do some boarding passes fail to mention when gates close?
For example I recently saw:
While some boarding passes do mention when gates close:
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There are a few reasons:
Generally, airlines put two times on the ticket: - Departure time - the scheduled departure time. The same time as on your ticket and the time shown on all monitors. - Boarding time / Gate close time - the time which the airline encourage you to be not far from the gate, so the flight can go without the delay.
The original ATB (automated ticket/boarding pass) format did not include separate "gate closes" and "gate opens" time field; there was only one field for "boarding time". In the illustration below it is printed as "BOARD TIME". The specification describes this field only as "Blank or boarding time ... when available at time of check in" with no further detail on whether it's boarding start or boarding end. Probably different decisions were made by the practicalities faced by different airlines at the time the format was adopted.
The strict regulation of boarding cards was intended to allow tickets and boarding passes to be interoperable between IATA member airlines through automatic optical character recognition. Obviously, this is no longer necessary.
While the left hand side (entitled "Passenger Ticket and Baggage Check") is not in common use since paper tickets went away (with some exceptions*), the right hand side "Passenger Coupon" or boarding pass stub has remained consistent for many decades, and only in the last few years has it begun to disappear.
* AA must have had about two decades' worth of ATB-style ticket paper in a store somewhere: I was still getting these cute 90s-style boarding passes back in 2016.