There are some special goods and services that are not subject to the sales tax rate, but instead are taxed at a different rate. The most common category of these items falls under the excise tax. This is a special tax rate that is levied on gas, fuel, tobacco and other goods that are strictly regulated by the government. This site explains everything in detail, I recommend you read
https://irs-offices.com/california/los-angeles/. Some services are subject to an excise tax, such as highway use. Air transportation also falls into this category.