Code Sharing

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I read this article, but still don't really get code sharing. I know when I book flights, I look at them very carefully to make sure I'm comfortable with which airlines I'll "actually" be flying on. I've heard of people having issues with communications between the carriers, but I've yet to have a serious issue, other than a tight turn around in Frankfurt once.

https://www.wsj.com/articles/crack-your-flights-complicated-code-share-1517408900

Avoid Code-Share Confusion
Airlines expand their networks by selling seats on partner airlines. But travelers need to take extra steps to make sure their trip goes smoothly.

• Shop Around—Because many partners price independently, you may find a cheaper fare on the same flight booking a partner flight directly. Be aware that rules may change, such as how many miles you collect.
• Make the Call—After you book a foreign airline through a U.S. airline flight code, call the operating carrier and ask for a seat assignment if it isn’t available online. Some carriers will accommodate, or offer to sell you a seat assignment—an option rarely available through the partner’s website.
• Go the Extra Mile—When trying to redeem frequent-flier miles for international trips, call your airline in addition to looking online. In many cases, code-share inventory isn’t available online, but reservation agents have access to partner flights for mileage redemption.
• Number, Please—Make sure your frequent-flier number gets into your passenger record and is on your boarding pass. It’s your key to benefits.
• Study Up—When flying on a code-share ticket, it’s worth checking baggage limits and fees, seat-assignment rules and elite-level benefits on partners. At least you’ll know what not to expect.
• Help Me—Know where to go for help if you get stranded by a canceled flight or if your bag gets lost between partner airlines. Sometimes the airline that sold the ticket is responsible, even if it didn’t operate the flight. Other times you need to be able to contact the airline actually flying you. Keep phone numbers for both.
• #UseSocialMedia—You often get a faster response from airlines if you tweet your troubles and include the airline’s hashtag.
• Pack Carefully—Checked baggage weight limits may be different for code-share flights than what you are used to. Rules are supposed to be printed on your ticket. Use caution with carry-on bags. The operating airline’s rules are in force. That may mean only one item, not two, and severe size and weight limits.