These three fulltext databases together cover most available fulltext news sources. Their contents overlap, but each database has a particular strength.
These databases present newspaper page-images with searchable fulltext for recent content.
The Penn Libraries host subscriptions for several major news website and mobile applications. These typically require an initial website registration through PennKey authentication. Registration may require patrons to specify their expected graduation date.
Searchable content on these websites and apps may extend back only a few years. For sure-footed content searching, consider using the Newspaper Compilations on this page.
The current list of subscriptions is kept here: https://www.library.upenn.edu/featured-services/newspaper-subscriptions