1984 United was the first and only airline to fly mainline to all 50 states. They had a promo that if you could fly into or out of all 50 within 50 days, you would get unlimited first class for a year.
https://www.washingtonpost.com/archi...-a68060fa8130/
i was only 14 at the time, but I used my timetable to map out my route!