Of course it's easier to reach by ship, the ice wall encircles all other continents.
Generally, it's easier to cross massive ice walls by flying over them than trying to cross it in a ship.
I never said that it wasn't easier to cross by plane, I was speaking of getting there. I have never seen an advertised commercial flight to Antarctica.
You've never seen an advertised commercial flight to Antarctica for the simple reason that you've never looked for one.
Lo and behold, the following link, which was found by using the internet (google search 'sight seeing flights to Antarctica')
shows one of many commercial sight seeing companies (Qantas) offering scenic flights to Antarctica. There are of course many, many others if you would only look. But of course it's this sort of thing that FEer's hate to see because it completely destroys their theory, ie 24 hour Antarctic sun.
http://www.antarcticaflights.com.au/Air New Zealand also used to operate scenic flights to Antarctica, but these were discontinued in 1979, after one of the flights crashed into Mt Erebus during white-out conditions.
https://en.wikipedia.org/wiki/Air_New_Zealand_Flight_901