Upvote:6
In 1960, a round-trip from New York to London cost $350, according to a Pan Am advertis*m*nt. The same trip today, booked out-of-season, in economy class, with a layover and sufficiently in advance costs around $550, an increase of 60%. The official inflation rate was around 800% over the same time period, so it seems that the cheapest air fares have decreased by around 80%. Various sources confirm that air-travel prices have indeed gone down:
Therefore the answer is yes, it's feasible that the dollar value of both tickets stayed the same over the years.