| Position | Duration |
| Chairperson, Committee on Public Accounts | 14 August 2024 – Present |
| Elected to 18th Lok Sabha | June 2024 |
| Member, Committee on Defence | September 2021 – Present |
| Member, Consultative Committee for the Ministry of Education | July 2020 – Present |
| Member, Committee on Transport, Tourism, and Culture | July 2020 – September 2021 |
| Elected to Rajya Sabha | June 2020 – June 2024 |
| Member, Joint Committee on the Enforcement of Security Interest and Recovery of Debts Laws and Miscellaneous Provision (Amendment) Bill, 2016 | 11 May 2016 – Present |
| Member, Consultative Committee, Ministry of Human Resource Development | |
| Member, Railway Convention Committee (R .) | 27 April 2015 – Present |
| Deputy Whip, Congress Parliamentary Party (Lok Sabha) | |
| Member, Standing Committee on Transport, Tourism, and Culture | |
| Member, Committee on Government Assurances | 1 September 2014 – Present |
| Re-elected to 16th Lok Sabha (2nd term) | May 2014 |
| Union Minister of State for Civil Aviation | 1 May 2012 – 2014 |
| Union Minister of State, Ministry of Civil Aviation | 28 October 2012 – 2014 |
| Union Minister of State, Ministry of Power | 1 May 2011 – |
| Union Minister of State, Ministry of Power | 19 January 2011 – 28 October 2012 |
| Member, India-Bangladesh Parliamentary Friendship Group | 22 July 2010 |
| Member, Consultative Committee, Ministry of Agriculture | |
| Member, Railway Convention Committee | |
| Member, Standing Committee on Transport, Tourism, and Culture | 31 August 2009 |
| Member, Committee on Estimates | 6 August 2009 |
| Elected to 15th Lok Sabha | 2009 |
| Cabinet Minister, Government of Kerala | 1 September 2004 – 2006 |
| Minister for Tourism and Devaswom, Government of Kerala | 2004 – 2006 |
| Member of Legislative Assembly (MLA), Kerala | 1 May 1996 – 2009 |
| Member, Kerala Legislative Assembly (Three Terms) | 1996 – 2009 |
