Except the comparison point before the nickle-and-diming isn't 30 years ago.. it's about 10. It was the soaring cost of oil and the recession that lead to the run to charge for bags, seats, food, even pillows. For instance, American started charging for first bag in 2008. The success of Southwest... internet fare shopping.. the rising costs.. and success of the 'bargin' carriers doing it.. lead to the mainstream carriers getting onboard with the nickle&dime business model. It's also why in this time period we had new consumer protection changes forcing carriers to quote total cost, not being able to get away with advertising fares before fees, etc.
They are creating bundles of service you largely had for free before... under the guise of new values. Instead of addressing legitimate customer service issues (new security overhead, long bus waits, overcrowded buses) the solution is providing 'premium services' that you can buy your way out of things. That is not customer service - that's opportunistic abuse.