Boston and Omaha are about 1,279 miles apart by road. Split the difference and you arrive near Detroit, the city closest to the halfway point between them. That puts roughly 12 hr 49 min of driving on the Boston side and 14 hr on the Omaha side — the fairest single meeting point among the cities near the middle.
Over this distance most people will fly rather than drive the whole way. Detroit still makes a fair, central place for Boston and Omaha to converge, splitting the travel instead of asking one side to cross the country.
If Detroit doesn't have what you're after, Cleveland and Columbus are also close to the midpoint and worth a look — each keeps the drive reasonably balanced between Boston and Omaha.
City descriptions adapted from Wikipedia (CC BY-SA); photos via Wikimedia Commons, credited above.