Originally Posted by
AA2070
The newer, thinner, and presumably cheaper BP stock does not contain a magnetic strip on the back, and instead contains a barcode on the top center. The green ones can go through the tractor-type BP reader, while the blue ones just need the barcode scanned.
Although if you were really curious, you could contact
Mercury Graphics about it.
And the blue ones give
some passengers problems because they tare and bend. The blue ones dont scan very well scan very well in the machine (not getting mileage).
I only found green stock at SFO AND MIA this year.