It depends on the airline. For JetBlue, there is no need to call. For United, it is necessary to list via the id90travel website:
Must make their flight listing via the UA Web Flight Listing Tool (available through the ID90T website www.id90travel.com
- Username: XXemp (XX = your two letter airline code)
- Password: ### (### = your billing code/three digit ticket designator)
The above info is from flyzed.info which has a lot of helpful info when traveling on a zed ticket. For UA & B6, you may check in on the respective app 24 hours prior to departure. The B6 app will even show you your position on the standby list and how many seats are available after checking in.
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