And here is my version of this, edited to reflect modern day sensibilities and methods of travel.
1) (I don't have an equivalent for the "good hat," but it is generally good advice to carefully secure one's possessions and protect them from damage.
2) Be sure to wear dark, comfortable clothing. If you make it through a flight without spilling something on yourself, you are a better woman than I. If you are lucky, it will only be your complimentary beverage.
3) Make sure you have a small bag of necessities in your purse that you can remove and put in the seat-pocket in front of you. This should include lotion, painkillers, a watch, a book, and the music player of your choice. There will be times during the flight where you desperately need one or more these things, but cannot reach your purse without unbuckling your seat belt. Having them close will be a great comfort.
4) The airplane is likely to be quite chilly. If you are likely to be too cold, be sure to travel with thick socks, a warm sweater, and a shawl or scarf to rest on your lap. All of these items should be sturdy and dark (see point number 2).
5) A prudent young woman will always bring the following:
a) a few good books, because being forced to read fashion magazines for several hours could prove your undoing, and the on-flight magazine is both last month's and rather dull besides,
b) a bottle for water and some Dramamine, in case there is unexpected turbulence,
c) appropriate medications, such as pain killers and the aforementioned Dramamine.
6) Be sure to reserve an aisle seat. This way, you will be able to use the facilities and have an excuse to stretch your legs without crawling over your fellow passengers.
In other words, with a few minor exceptions, it seems like pretty good advice for long-haul ocean travel.
But it is definitely amusing to look at what was once sage advice, and have to puzzle out why exactly it made so much sense!