Lengthy article so following excerpts are the most pertinent

"Lost Bags and Bag Fees.
Airlines will now be required to refund any fee for carrying a bag if the bag is lost. Airlines will also be required to apply the same baggage allowances and fees for all segments of a trip, including segments with interline and code share partners. Airlines are already required to compensate passengers for reasonable expenses for loss, damage or delay in the carriage of passenger baggage.

Full Disclosure of Additional Fees. Airlines will also have to prominently disclose all potential fees on their websites, including but not limited to fees for baggage, meals, canceling or changing reservations, or advanced or upgraded seating. In addition, airlines and ticket agents will be required to refer passengers both before and after purchase to up-to-date baggage fee information, and to include all government taxes and fees in every advertised price. Previously, government taxes and fees were not required to be included in the up-front fare quotation.

Bumping. ... Under the new rule, bumped passengers subject to short delays will receive compensation equal to double the price of their tickets up to $650, while those subject to longer delays would receive payments of four times the value of their tickets, up to $1,300. Inflation adjustments will be made to those compensation limits every two years.

Tarmac Delays. The new rule expands the existing ban on lengthy tarmac delays to cover foreign airlines’ operations at U.S. airports and establishes a four hour hard time limit on tarmac delays for international flights of U.S. and foreign airlines, with exceptions allowed only for safety, security or air traffic control-related reasons. Carriers must also ensure that passengers stuck on the tarmac are provided adequate food and water after two hours, as well as working lavatories and any necessary medical treatment.

Requiring airlines to allow reservations to be held at the quoted fare without payment, or cancelled without penalty, for at least 24 hours after the reservation is made, if the reservation is made one week or more prior to a flight’s departure date.

Requiring airlines to promptly notify consumers of delays of over 30 minutes, as well as cancellations and diversions. This notification must take place in the boarding gate area, on a carrier’s telephone reservation system and on its website.

Banning post-purchase fare increases unless they are due to government-imposed taxes or fees, and only if the passenger is notified of and agrees to the potential increase at the time of sale."