There are many small filling station/convenience store outlets under the Pilot brand. These will not have truck stop facilities, and many don't even pump diesel. That's where Pilot got started, before expanding into the truck stop and travel center business, and Pilot did a lot of expansion in the 70s and 80s buying up small outlets along the Interstate system in the middle of the country.
Flying J's should all be at least truck stops, some developed into travel centers for a broader audience, except that since Pilot bought the Flying J brand, they could have applied it to lesser facilities. But I don't think so, most everything new gets the Pilot brand.
For the past 35 years I've been in Love's country, prefer to stop there rather than Pilot, so I don't get into a lot of Pilot stations. Even when out of Love's country, I tend to prefer Petro over Pilot when looking for travel center facilities. Some of the Petro travel centers are almost destinations, like the Joplin I-44 travel center in SW Missouri.