Some barcodes included in airline emails may actually be for a receipt or proof of purchase.
These cannot be used as a boarding pass, so be sure to read the fine print.
The barcode can be a common rectangular one or asquare QR code.

Is There a Boarding Pass App?
Apples iPhone has theWallet appand Android smartphones use theGoogle Pay app.
No additional apps needed.

It can be used to make phone payments and store membership cards, e-tickets, and airline boarding passes.
Mobile boarding passes can sometimes be added to the Wallet app automatically if your rig detects it.
Do I Need to Print My Boarding Pass?
This isnt something that it’s crucial that you worry about.
What Do I Do With a Mobile Boarding Pass?
Afraid of an app or technical error?
Take a screenshot of your mobile boarding pass barcode.
This way you’ve got the option to quickly access it from your devices photos app.
FAQ
Mobile boarding passes are not available for all Southwest flights and passengers.
International passengers, infants, unaccompanied minors, and passengers with fares that require verification (i.e.
seniors and military) cannot get a mobile boarding pass.
You should see the official TSA PreCheck indicator on your boarding pass.