Reddit mentions of Six Practical Lessons Childbirth

Absolutely no issues with flying during pregnancy. Some airlines restrict pregnant women from flying past ~36 weeks, but I think that's because they don't want you going into labor in their airplane cabin at 32,000 feet. After getting thru security, buy a bottle of water for your wife. I was on a 2-hour flight over Christmas and was dying of thirst waiting for the drink cart to come down the aisle. Also, give her the aisle seat if possible so she can walk the aisles periodically to keep the blood moving and access the bathroom quickly if needed.

As for books, I've read a lot of good ones. I've liked the Mayo Clinic Guide to a Healthy Pregnancy, and Elisabeth Bing's Six Practical Lessons for an Easier Childbirth and Ina May's Guide to Childbirth for info on labor and delivery, and The Happiest Baby on the Block and the Wonder Weeks for infant care. Also The Birth Partner is a great book on delivery for both pregnant women and husbands. If you can find a secondhand bookstore near you, check it out--a lot of people sell off these types of books once they're done with them.