When I contacted DL I was told it was included and the bolded line items account for the $29 tax. This ticket was purchased August 2015/Reissued a few weeks ago when RUCs cleared.

This posting shows that other airlines include/list the fee in a similar manner:
http://costa-rica-guide.com/practica...departure-tax/

Taxes, Fees and Charges
Per Passenger Summary Of Air Travel Taxes, Fees, And Related Charges. Per Passenger Total Travel Charges Provided At End Of Table
Description Amount Currency
Sierra Leone - Sierra Leone-Immigration Fee (A1) $2.00 USD
United States - September 11th Security Fee(Passenger Civil Aviation Security Service Fee) (AY) $11.20 USD
B1 $27.00 USD
Costa Rica - Common Area User Charge (FS) $3.52 USD
Costa Rica - Security Fee (IK) $5.30 USD
Costa Rica - Tourism Arrival Tax (NW) $15.00 USD
United States - Transportation Tax (US) $35.40 USD
United States - Animal And Plant Health Inspection Service Fee (APHIS User Fee - Passengers (XA) $5.00 USD
United States - Passenger Facility Charge (XF) $13.50 USD
United States - Immigration And Naturalization Fee(Immigration User Fee) (XY) $7.00 USD
United States - Custom User Fee (YC) $5.50 USD