What do the AI Trip Build day limits mean?

The $9.99 AI Trip Build covers itineraries up to 15 generated travel days for Standard and Premium. Starter accounts can buy AI Trip Build, but the generated draft covers only the first 5 travel days unless the account is upgraded before generation. On Standard or Premium, a longer trip can keep its full date range while the AI draft covers the first limited set of days; you can complete later days manually. Starter remains limited to 5 trip days. An eligible paid plan is required to add later days.