A barcode built from stacked lines
Many mobile boarding passes use a two-dimensional barcode made of rows of tiny marks. At a glance, those rows can resemble the dark bands of a magnetic stripe, but they work differently: the barcode is an image a camera or optical scanner can read, not a strip that must pass through a reader.
That dense pattern is useful because it can carry machine-readable information in a compact space. The airline’s system creates it as part of issuing the pass, so an airport scanner can use the code to look up or verify the passenger’s trip.
From phone screen to gate decision
At the gate, the scanner captures the pattern and decodes it. The resulting information lets the airline’s system check whether the pass matches the flight and whether the traveler is cleared to board. The agent sees the result; the passenger does not need to explain or display the details one by one.
The screen therefore replaces a printed card without changing the basic checkpoint: present a pass, have it read, and confirm that it is valid for this flight. The stripes are only a visual resemblance—the practical link between old and new passes is the job they perform, not the way a reader extracts their information.
