If you are using a version of ForeFlight Mobile prior to version 13.3, it is only possible to link one Jeppesen account to your ForeFlight account.
Single-pilot accounts (Basic Plus, Pro Plus, Performance Plus) :
If you have purchased Jeppesen coverage through ForeFlight and you link one or more Jeppesen account(s) to your ForeFlight account in the app on the More > Jeppesen page (or on ForeFlight on the web) the Jeppesen coverages in ForeFlight Mobile will be "combined", eg: you will have simultaneous access to the Jeppesen coverage purchased through ForeFlight as well as the Jeppesen coverage from the linked account(s).
IMPORTANT: After linking the Jeppesen account to your ForeFlight account you will need to delete and re-download the Jeppesen Terminal Charts to have the "combined: coverage. See this article for details.
If you have not purchased Jeppesen coverage through Foreflight and you link multiple Jeppesen accounts to your ForeFlight account, the coverages are not "combined" so you will be able to choose between the Jeppesen coverages on the different Jeppesen accounts via the More > Jeppesen tab of the app.
Multi-pilot accounts (Business Pro, Business Performance) :
Multi-pilot accounts must link Jeppesen account(s) to the ForeFlight account on ForeFlight on the web. See this article for detailed instructions. NOTE: If you link multiple Jeppesen accounts to your ForeFlight account the coverages are not "combined" but you will be able to choose between the Jeppesen coverages on the different Jeppesen accounts via the More > Jeppesen tab of the app.
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