Actually, they probably are the highest.

You won't believe how high some of these fees for things like excess baggage and shipping pets are. Take a look. Sigh.

Checked Baggage (each piece, each way)

Second bag

$25 (except for first, business, full fare passengers and upper level frequent flyer members)

Excess bags

Travel within the United States, U.S. Virgin Islands, and Puerto Rico

Bags 3, 4, and 5: $80 each
Bags 6, 7, and 8:  $110 each (does anyone really fly with 8 bags?)
Bags 9 and 10: $180 each

Travel outside the United States, U.S. Virgin Islands, and Puerto Rico

Bags 3, 4, and 5: $150 each
Bags 6, 7, and 8: $300 each
Bags 9 and 10: $600 each

Overweight bags

Checked baggage weighing over 50 lbs/23 kgs but not more than 70 lbs/32 kgs will be charged at the rate of $80 per piece.

Checked baggage weighing over 70lbs/32 kgs but not more than 100 lbs/45 kgs will be charged at the rate of $150 per piece.

Oversized bags

62–80 inches—total of length plus width plus height: $150 each

Curbside check-in

$3 per bag plus tip,
except:
Platinum, Gold and Silver Medallions
Customers traveling in First Class
Customers traveling in BusinessElite
Customers who have checked-in bags online at delta.com
 

Booking tickets
Booking online: no charge
Booking by phone: $25       
Booking in person: $25
 

Children
Lap children: 10% of the adult fare on international fares
Unaccompanied minors: $100 each way

Frequent flyer tickets
Travel ticketed 20 days or less: $75 (waived for Platinum frequent flyers)
Same day change of flight: $50
Tickets issued in person or by phone: $25-$50
Redepositing miles: $100
Changing frequent flyer tickets: $100 
Non-Delta flight segment in Award Ticket itinerary: $25
More info

Pets
In cabin (domestic flight): $100 each way
As cargo (domestic): $178 to $669 depending on weight, each way
More info

Seating
Advance seat selection: none
Exit row and other “premium” seats: none

Ticket changes (non-refundable tickets, domestic fares)
Changing travel dates after purchase: $100 ($200 or more for international fares)
Fare drop refund (fee charged for re-issuing ticket if a fare goes down between the time you buy and the time you fly): $100
Additional change fees for tickets not issued directly by Delta or Delta.com (includes tickets bought from online agencies such as Orbitz and over the phone or in person, even if by Delta): $30

Same day confirmed standby on an earlier or later flight: $50
More info