Filed by Pinnacle Entertainment, Inc.
                       Pursuant to Rule 425 under the Securities Act of 1933 and
     deemed filed pursuant to Rule 14a-12 of the Securities Exchange Act of 1934

                                              Subject Company: Aztar Corporation
                                                     Commission File No. 1-12092

On May 19, 2006, Pinnacle Entertainment, Inc. published the following press
release:

[PINNACLE ENTERTAINMENT LOGO]                  PINNACLE ENTERTAINMENT, INC.
                                               3800 Howard Hughes Parkway
                                               Las Vegas, Nevada 89109
                                               NYSE: PNK
================================================================================

FOR FURTHER INFORMATION:

Pinnacle Entertainment:                  Joele Frank, Wilkinson Brimmer Katcher:
-----------------------                  ---------------------------------------
Lewis Fanger (Investors)-(702) 784-7777       Dan Katcher (Media)-(212) 355-4449
Pauline Yoshihashi (Media)-(702) 784-7777

      PINNACLE ENTERTAINMENT MAKES ANNOUNCEMENT REGARDING MERGER AGREEMENT
                             WITH AZTAR CORPORATION

LAS  VEGAS,  May 19,  2006 -  Pinnacle  Entertainment,  Inc.  (NYSE:  PNK) today
announced  that its board of  directors  unanimously  voted not to increase  the
per-share  price under the Company's  merger  agreement  with Aztar  Corporation
(NYSE:  AZR). As announced on May 5, 2006,  Pinnacle amended the per-share price
under the Company's  merger agreement with Aztar to $51.00 per share in cash and
Pinnacle stock, subject to adjustment.  The fully financed transaction is valued
at $2.58  billion,  including  approximately  $1.97 billion in equity on a fully
diluted basis and approximately $677 million of indebtedness.

"After careful consideration and due diligence,  Pinnacle's management and board
of directors have determined not to increase Pinnacle's offer to acquire Aztar,"
Daniel R. Lee,  Pinnacle's  Chairman  and Chief  Executive  Officer,  said.  "We
believe that our merger  agreement at $51 per share makes  compelling  strategic
and  financial  sense for Pinnacle and Aztar  shareholders,  and that the equity
portion  of the  consideration  offers  Aztar  shareholders  an  opportunity  to
participate in the potential upside of the combined companies.  Pinnacle remains
ready to complete this fully financed  transaction  in a timely manner,  and has
made all applicable gaming regulatory filings related to the transaction."

ABOUT PINNACLE ENTERTAINMENT
Pinnacle Entertainment owns and operates casinos in Nevada,  Louisiana,  Indiana
and Argentina, owns a hotel in Missouri,  receives lease income from a card club
casino in the Los  Angeles  metropolitan  area,  has been  licensed to operate a
small  casino  in the  Bahamas,  and  owns a  casino  site  and has  significant
insurance claims related to a  hurricane-damaged  casino previously  operated in
Biloxi,  Mississippi.  Pinnacle also has two casino development  projects in the
St. Louis,  Missouri  area.  The  development  projects are dependent upon final
approval by the Missouri Gaming Commission.

ALL STATEMENTS INCLUDED IN THIS PRESS RELEASE, OTHER THAN HISTORICAL INFORMATION
OR STATEMENTS OF HISTORICAL FACT, ARE  "FORWARD-LOOKING  STATEMENTS"  WITHIN THE
MEANING  OF  THE  PRIVATE  SECURITIES  LITIGATION  REFORM  ACT  OF  1995.  THESE
FORWARD-LOOKING STATEMENTS, INCLUDING STATEMENTS REGARDING THE COMPANY'S PENDING
ACQUISITION OF AZTAR INCLUDING ANTICIPATED STRATEGIC BENEFITS OF THE ACQUISITION
AND POTENTIAL FUTURE  DEVELOPMENT OF THE TROPICANA LAS VEGAS SITE, THE COMPANY'S
NEW DEVELOPMENT  OPPORTUNITIES AND ANTICIPATED  CONSTRUCTION SCHEDULES AND COSTS
AND ANTICIPATED  OPENING DATES,  ANTICIPATED FUTURE RESULTS AT L'AUBERGE DU LAC,
AND THE EXPECTED RECEIPT OF INSURANCE  PROCEEDS INCLUDING THE AMOUNT OF ANY SUCH
RECOVERY AND SUFFICIENCY OF SUCH INSURANCE COVERAGES,  ARE BASED ON MANAGEMENT'S
CURRENT  EXPECTATIONS  AND ARE  SUBJECT TO RISKS,  UNCERTAINTIES  AND CHANGES IN
CIRCUMSTANCES  THAT COULD  SIGNIFICANTLY  AFFECT  FUTURE  RESULTS.  ACCORDINGLY,
PINNACLE  ENTERTAINMENT  CAUTIONS THAT THE FORWARD-LOOKING  STATEMENTS CONTAINED
HEREIN ARE  QUALIFIED  BY IMPORTANT  FACTORS THAT COULD CAUSE ACTUAL  RESULTS TO
DIFFER MATERIALLY FROM THOSE REFLECTED BY SUCH STATEMENTS. SUCH FACTORS INCLUDE,
BUT ARE NOT  LIMITED  TO:  (A) THE RISK THAT THE  ACQUISITION  OF AZTAR DOES NOT
CLOSE; (B) THE SUBSTANTIAL  INCREASE IN THE COMPANY'S  INDEBTEDNESS IF THE AZTAR
ACQUISITION  DOES CLOSE;  (C) THE COMPANY'S  REDEVELOPMENT  OF THE TROPICANA LAS
VEGAS  SITE (IF THE AZTAR  ACQUISITION  CLOSES)  WOULD BE A PROJECT  OF A LARGER
SCALE THAN ANY THE COMPANY HAS UNDERTAKEN TO DATE, AND IS SUBJECT TO SIGNIFICANT
RISKS AND  CONTINGENCIES,  INCLUDING THE  AVAILABILITY AND COST OF FINANCING AND
CONSTRUCTION  RISKS; (D) IF THE AZTAR ACQUISITION CLOSES, THE COMBINED COMPANY'S
POST-ACQUISITION RESULTS OF OPERATIONS MAY NOT MEET EXPECTATIONS, WHICH MAY MAKE
IT  DIFFICULT  FOR THE  COMPANY  TO  SERVICE  THE  DEBT IT  WOULD  INCUR  IN THE
TRANSACTION;  (E)  SIGNIFICANT  COMPETITION  FACING  THE  COMPANY  IN ALL OF ITS
MARKETS,  INCLUDING  INCREASINGLY  COMPETITIVE NATIVE AMERICAN GAMING FACILITIES
AFFECTING   RENO   GAMING    PROPERTIES    AND   OTHER    MARKETS;    (F)   MANY
CONSTRUCTION-RELATED  FACTORS  COULD  PREVENT THE COMPANY  FROM  COMPLETING  ITS
CONSTRUCTION AND DEVELOPMENT

PROJECTS  WITHIN  BUDGET AND ON TIME;  (G) BECAUSE THE COMPANY HAS  CONSIDERABLE
LEVERAGE,  FUTURE  CASH  FLOWS  MAY  NOT BE  SUFFICIENT  TO MEET  ITS  FINANCIAL
OBLIGATIONS  AND  THE  COMPANY  MIGHT  HAVE  DIFFICULTY   OBTAINING   ADDITIONAL
FINANCING;  (H) THE RISK THAT THE  PROPOSED  ST.  LOUIS  PROJECTS,  THE PROPOSED
EXPANSIONS TO THE EXISTING FACILITIES AND OTHER CAPITAL INTENSIVE PROJECTS COULD
STRAIN THE COMPANY'S FINANCIAL RESOURCES AND THE RISK THAT SUCH PROJECTS AND NEW
DEVELOPMENTS SUCH AS L'AUBERGE DU LAC MIGHT NOT PROVIDE FOR A SUFFICIENT RETURN,
IF ANY;  (I) THE RESULTS OF THE DAMAGE  FROM  HURRICANES  KATRINA AND RITA,  AND
INSURANCE PROCEEDS AVAILABLE TO THE COMPANY, INCLUDING THE IMPACT TO COMMUNITIES
SURROUNDING THE COMPANY'S  AFFECTED  PROPERTIES AND ISSUES THAT COULD ARISE WITH
RESPECT TO OUR INSURANCE  POLICIES THAT COULD REDUCE OR SIGNIFICANTLY  DELAY THE
RECEIPT OF INSURANCE PROCEEDS; (J) THE DECISIONS OF THE COMPANY'S COMPETITORS TO
REBUILD OR REOPEN THEIR  FACILITIES IN THE NEW ORLEANS AND LAKE CHARLES  MARKETS
COULD  CREATE  ADDITIONAL  COMPETITION  IN THOSE  MARKETS AND THUS MAKES  FUTURE
OPERATING RESULTS AT THOSE PROPERTIES LESS PREDICTABLE; (K) L'AUBERGE DU LAC MAY
NOT ACHIEVE ITS FORECASTED  FINANCIAL  RESULTS;  AND (L) OTHER RISKS,  INCLUDING
THOSE AS MAY BE DETAILED FROM TIME TO TIME IN PINNACLE  ENTERTAINMENT'S  FILINGS
WITH THE SECURITIES AND EXCHANGE COMMISSION ("SEC"). FOR MORE INFORMATION ON THE
POTENTIAL  FACTORS  THAT  COULD  AFFECT  THE  COMPANY'S  FINANCIAL  RESULTS  AND
BUSINESS, REVIEW THE COMPANY'S FILINGS WITH THE SEC, INCLUDING ITS ANNUAL REPORT
ON FORM 10-K, ITS QUARTERLY REPORTS ON FORM 10-Q AND ITS CURRENT REPORTS ON FORM
8-K.

NOTE: In connection with the proposed acquisition of Aztar Corporation, Pinnacle
Entertainment,  Inc. intends to file a registration statement, including a proxy
statement of Aztar  Corporation,  and other  materials  with the  Securities and
Exchange  Commission (the "SEC").  Investors are urged to read the  registration
statement  and other  materials  when they are  available  because  they contain
important  information.  Investors  will be able to  obtain  free  copies of the
registration statement and proxy statement,  when they become available, as well
as other filings containing  information about Pinnacle Entertainment and Aztar,
without charge, at the SEC's Internet site (http://www.sec.gov). These documents
may also be obtained  for free from  Pinnacle by directing a request to Pinnacle
Entertainment,  Inc.,  3800 Howard  Hughes  Parkway,  Las Vegas,  Nevada  89109,
Attention: Investor Relations. Free copies of Aztar's filings may be obtained by
directing a request to Aztar  Corporation,  2390 East Camelback Road, Suite 400,
Phoenix, Arizona 85016, Attention: Secretary.


ADDITIONAL INFORMATION AND WHERE TO FIND IT


This press release may be deemed to be  solicitation  material in respect of the
proposed merger of Aztar and Pinnacle.  In connection with the proposed  merger,
Aztar  plans to file a proxy  statement  with the SEC.  INVESTORS  AND  SECURITY
HOLDERS OF AZTAR ARE ADVISED TO READ THE PROXY  STATEMENT AND ANY OTHER RELEVANT
DOCUMENTS FILED WITH THE SEC WHEN THEY BECOME AVAILABLE  BECAUSE THOSE DOCUMENTS
WILL CONTAIN IMPORTANT  INFORMATION  ABOUT THE PROPOSED MERGER.  The final proxy
statement  will be  mailed to  stockholders  of Aztar.  Investors  and  security
holders  may  obtain  a free  copy  of the  proxy  statement,  when  it  becomes
available,  and other  documents  filed by Aztar with the SEC,  at the SEC's web
site at http://www.sec.gov.  Free copies of the proxy statement, when it becomes
available,  and Aztar's  other  filings  with the SEC may also be obtained  from
Aztar.  Free copies of Aztar's filings may be obtained by directing a request to
Aztar Corporation,  2390 East Camelback Road, Suite 400, Phoenix, Arizona 85016,
Attention: Secretary.

Aztar,  Pinnacle and their respective  directors,  executive  officers and other
members of their management and employees may be deemed to be soliciting proxies
from Aztar's stockholders in favor of the proposed merger. Information regarding
Aztar's directors and executive officers is available in Aztar's proxy statement
for its 2006  annual  meeting of  stockholders,  which was filed with the SEC on
April  10,  2006.  Information  regarding  Pinnacle's  directors  and  executive
officers is available in Pinnacle's  proxy statement for its 2006 annual meeting
of  stockholders,  which was filed  with the SEC on April 13,  2006.  Additional
information  regarding  the  interests of such  potential  participants  will be
included in the proxy statement and the other relevant  documents filed with the
SEC when they become available.