SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K Report of Foreign Private Issuer Pursuant to Rule 13a-16 or 15d-16 of the Securities Exchange Act of 1934 For the month of March, 2006 RYANAIR HOLDINGS PLC (Translation of registrant's name into English) c/o Ryanair Ltd Corporate Head Office Dublin Airport County Dublin Ireland (Address of principal executive offices) Indicate by check mark whether the registrant files or will file annual reports under cover Form 20-F or Form 40-F. Form 20-F..X.. Form 40-F..... Indicate by check mark whether the registrant by furnishing the information contained in this Form is also thereby furnishing the information to the Commission pursuant to Rule 12g3-2(b) under the Securities Exchange Act of 1934. Yes ..... No ..X.. If "Yes" is marked, indicate below the file number assigned to the registrant in connection with Rule 12g3-2(b): 82- ________ Ryanair Holdings Plc 20th March 2006 Re: Holding in Company A Letter from The Capital Group Companies, Inc dated 16th March 2006 to Ryanair Holdings Plc, received by Ryanair Holdings Plc on the 17th March 2006. Re: Section 67 Notification Enclosed is a Section 67 Notification date 16th March 2006. Please note that one or more of the affiliates of The Capital Group Companies, Inc. have made notifications to your company pursuant to Section 67 in the past. For a description of our organisation, please visit our Web site at www.capgroup.com. For the purposes of this notification an outstanding share balance of 770,794,836 shares was used to calculate the percentages of holdings of the relevant share capital which determine the notifiable interest. We believe this outstanding share balance is current; however, if this number is not accurate, please contact us as soon as possible so we may make the necessary revisions to this notification. Should you have questions or require additional information, please contact Gina Martinez or Vivien Tan at (213) 815 -0489, or send a fax message to (213) 486-9698. Alternatively, you may contact us via E-mail at GRGroup@capgroup.com. Vivien Tan Compliance Associate The Capital Group Companies, Inc. A Letter from The Capital Group Companies, Inc. to Ryanair Holdings Plc dated 16 March 2006 Notification of Interests (Section 67 Companies Act 1990) This Notice is given by The Capital Group Companies, Inc. on behalf of its affiliates, including Capital Research and Management Company, Capital International,Inc., Capital International S.A., Capital Guardian Trust Company, and Capital International Limited, pursuant to Section 67 of the Companies Act, 1990. The interest in the relevant share capital indicated below arises by virtue of holdings attributed to the Companies (see Schedule A). These holdings form part of funds managed on behalf of investment clients by the Companies. Share capital to which this relates: Ordinary Shares (including ADRs) Number of shares in which the Companies have a notifiable interest: 39,543,858 Ordinary Shares (including ADRs) Name(s) of registered holder(s): See Schedule B As of 16 March 2006 Ryanair Holdings Plc Number of Shares Percent of Outstanding The Capital Group Companies, Inc. ("CG") Holdings 39,543,858 5.130% Holdings by CG Management Companies and Funds: Capital Guardian Trust Company 6,698,081 0.869% Capital International Limited 5,315,559 0.690% Capital International S.A. 1,121,835 0.146% Capital International Inc 346,588 0.045% Capital Research and Management 26,061,795 3.381% Company Schedule A Schedule of holdings in Ryanair Holdings, Plc As of 16 March 2006 CAPITAL GUARDIAN TRUST COMPANY Registered Name Local Shares Cede & Co 5,485,500 55 Water Street New York, NY 10006 Alibank Nominees Limited 1,212,581 Allied Irish Bank, Stock Exchange and Trust Services Bank Centre, P.O.Box 512 Dublin, Ballsbridge Total 6,698,081 Schedule B CAPITAL INTERNATIONAL LIMITED Registered Name Local Shares Bank of New York Nominees 823,895 Bank of New York 3 Birchin Lane London EC3V 9BY Northern Trust 438,933 C/O NorTrust Nominees Limited 155 Bishopsgate London EC2M 3XS Cede & Co 195,990 55 Water Street New York NY 10006 Citibank London 69,530 11 Old Jewry London EC2R 8D8 UK Nortrust Nominees 75,134 155 Bishopsgate London EC2M 3XS United Kingdom Bank of Ireland 838,045 Intl Financial Services Centre 1 Harbourmaster Place Dublin 1 Allied Irish Bank Plc 775,443 Stock Exchange and Trust Services Bank Centre, P.O. Box 512 Ballsbridge, Dublin 4 MSS Nominees Limited 69,300 Midland Bank Plc Mariner House, Pepys London EC3N 4DA State Street Bank & Trust Co 362,086 Deutsche Bank AG 4,200 23 Great Winchester Street London EC2P 2AX United Kingdom Mellon Bank N.A. 9,800 London Branch London United Kingdom Alibank Nominees Limited 657,743 Allied Irish Bank Stock Exchange and Trust Services Bank Centre PO Box 512 Dublin Ballsbridge Citibank N.A. (Ireland) 93,500 IFSC House Custom House Quay Dublin 1 Bank of Ireland Nominees Limited 592,000 Bank of Ireland International Financial Services Center 1 Harbourmaster Place AIB Custodial Nominees Limited 97,100 JP Morgan Chase Bank 212,860 Total 5,315,559 Capital International S.A Registered Name Local Shares Cede & Co 980,435 55 Water Street New York NY 10006 Bank of Ireland 11,400 Intl Financial Services Centre 1 Harbourmaster Place Dublin 1 Bank of Ireland Nominees Limited 130,000 Bank of Ireland Intl Financial Services Centre 1 Harbourmaster Place Total 1,121,835 Schedule B Capital International, Inc Registered Name Local Shares Cede & Co 186,500 55 Water Street New York, NY 10006 Alibank Nominees Limited 160,088 Allied Irish Bank Stock Exchange and Trust Services Bank Centre P.O. Box 512 Dublin Ballsbridge Total 346,588 Schedule B Capital Research and Management Company Registered Name Local Shares Cede & Co 26,061,795 55 Water Street New York, NY 10006 Total 26,061,795 This announcement has been issued through the Companies Announcement Service of the Irish Stock Exchange. SIGNATURES Pursuant to the requirements of the Securities Exchange Act of 1934, the Registrant has duly caused this report to be signed on its behalf by the undersigned, hereunto duly authorized. RYANAIR HOLDINGS PLC Date: 20 March 2006 By:___/s/ James Callaghan____ James Callaghan Company Secretary & Finance Director