If you instead choose to fly across the path instead of along it, a slower plane would be a better choice, and you're back down to normal 2-minute types of totality times. Some planes have 1 window per row, some have approximately 3 windows per 2 rows. The number and cleanliness of windows is a detail which will be critical, as well as a good flight plan, and obviously, navigation and timing. The biggest advantages of an airplane are getting above the clouds for almost certain success, ability to change location rapidly if necessary, less time away from other commitments, and surprisingly low cost compared to a cruise or tour of Europe. In my own case, I must choose between taking the family to Europe, and missing a family reunion plus Stellafane, or chartering an eclipse flight and still making the reunion and Stellafane, not to mention making my employer much happier with less time off for me, right around bonus time.
General thoughts welcome on the list.
Specific interest in USA-based flight please respond to me privately. Totality on the ground exceeded 7 minutes . There's more drama to an eclipse than trying to outsmart the weather gods. Plus, in my case, it could be from an airport 0.5 to 1.5 hours from my house, and I'd get home in time to not even miss a day of work if I didn't want to. This would be different, that's for sure.