I read the Delta Blog post, Paperless Mobile Check-in Test at LaGuardia, and tried this out by loading my boarding pass onto my iPhone.
The TSA agent had NO IDEA what I was showing her, and made me print out a paper boarding pass.
This press release though, has a note about the exclusion:
Delta Partners With TSA to Launch Paperless Mobile Check-in At New York-LaGuardia | Reuters:
"Customers traveling in the U.S., checking in at LaGuardia may simply download their boarding pass to their mobile devices via delta.com and proceed directly to the airport security screening area."Except:
Currently, Delta's mobile check-in option is limited to its main LGAWould have been cool if it had worked.
terminal. It does not include DL Shuttle Marine Air terminal.