I can vouch for this firsthand, because yesterday I booked two domestic airline tickets on delta.com and the the fee breakdown was:
Fare: 442.79 USD
Tax: 43.91 TX
Total: 486.70 USD
The same exact itinerary today:
Fare: 433.49 USD
Tax: 7.00 TX
Total: 440.49 USD
Luckily Delta allows 24 hour risk-free cancellations, so I re-booked the itinerary at the lower rate (plus the fare dropped - whether that was due to the tax implications, I do not know) and then canceled my more expensive itinerary, saving me $92.42. Not bad!
If you are in the market for airline tickets, today could be a good day to make your bookings and take advantage of these savings. I'm not sure what the savings would be on an international ticket, but saving 10% was a nice little bonus for me since fares have been sky-high this summer!









