The court denied the companies petition on Monday, however, effectively validating the DOT’s price advertising rules.
The rules, which took full effect in 2012, were part of the DOT’s effort to enact a “Passenger’s Bill of Rights” for airline customers.
The new regulations include fines for airlines who keep passengers waiting on tarmacs for more than three hours and requiring refunds of bag fees for lost luggage.
Airlines face fines as high $27,500 for stranding passengers under the new rules. The airlines that filed the suit over the advertising rules had all been fined for violating them.
Spirit Airlines and AirTran Airways, which is owned by Southwest, were fined a combined $90,000 for violating the pricing rules in advertisements such as emails, tweets and on their websites. Allegiant Airlines was similarly fined for not including a convenience fee in initial fare quotes.