CUSIP No. 247918105 Page 13 of 13 pages

EXHIBIT A
JOINT REPORTING AGREEMENT

This will confirm the agreement by and among the undersigned that the Schedule 13G filed on or about this date with respect to the beneficial ownership of the undersigned of shares of ABX Air, Inc. is being filed on behalf of each of the parties named below.

Dated: December 15, 2006
THE PABRAI INVESTMENT FUND II, L.P.
	By:	Dalal Street, LLC, Its General Partner
		By:	/s/ Mohnish Pabrai
			Mohnish Pabrai, Chief Executive Officer
PABRAI INVESTMENT FUND 3, LTD.
	By:	/s/ Mohnish Pabrai
		Mohnish Pabrai, President
THE PABRAI INVESTMENT FUND IV, L.P.
	By:	Dalal Street, LLC, Its General Partner
		By:	/s/ Mohnish Pabrai
			Mohnish Pabrai, Chief Executive Officer
DALAL STREET, LLC
	By:	/s/ Mohnish Pabrai
		Mohnish Pabrai, Chief Executive Officer
/s/ Harina Kapoor
Harina Kapoor
/s/ Mohnish Pabrai
Mohnish Pabrai