Re: Amended and Restated Five-Year Credit Agreement dated as of January 20, 2006 (the “Credit Agreement”) Attention: Alfred P. Quirk, Vice President, Finance and Treasurer

Exhibit 99.6

Wachovia Bank,
N.A.
Xxx Xxxxx Xxxxx
Xxxxxx
Xxxxxxxxxxxx, XX
00000

WACHOVIA SECURITIES

Acceptance of Request for Extension

December 22, 2006

Aetna Inc.
000 Xxxxxxxxxx Xxxxxx
Xxxxxxxx, XX 00000

Re: Amended and Restated Five-Year Credit Agreement dated as of January 20, 2006 (the “Credit Agreement”)

Attention: Xxxxxx X. Xxxxx, Vice President, Finance and Treasurer

Dear Al:

We have received your Extension Request, dated December 5, 2006, and pursuant to Section 2.06(c) (Maturity of Loans) of the above-referenced Credit Agreement, we hereby agree to the extension set forth in such request. Upon the effectiveness of the Extension Request in accordance with Section 2.06(c) of the Credit Agreement, the new Maturity Date will be January 20, 2012.

We have made a notation of this extension on the Schedule of Loans, Payments of Principal attached to our Syndicated Note(s).

Very truly yours,

Wachovia Bank, National Association

By:		/s/ Xxxxxxxx X. Xxxxxxx
		Name: Xxxxxxxx X. Xxxxxxx
		Title: Director