Macquarie Infrastructure Company Reaffirms Guidance for 2008 Estimated Cash Available for Distribution

NEW YORK — Macquarie Infrastructure Company (NYSE: MIC), a leader in the ownership and operation of U.S. infrastructure businesses, has reaffirmed its guidance for estimated cash available for distribution ("CAD") in 2008. MIC expects that CAD will be in a range of between $114 million and $128 million for the year.

"The basic services nature of our infrastructure businesses provides us with good visibility into their cash generating capabilities over a reasonable horizon," said Peter Stokes, Chief Executive Officer of MIC. "Our visibility is further enhanced by the fact that financing costs have been locked in with debt facilities that are effectively fixed rate and have an average maturity out more than five and half years."

CAD is a non-GAAP measure used by the Company to estimate its ability to sustain and increase its quarterly dividend. CAD is based on cash from operating activities less financed capital expenditures, plus the cash dividend received from an unconsolidated business recorded in cash from investing activity.

MIC has posted a presentation regarding the Company that includes guidance for each of its operating businesses for 2008 on its website. The presentation can be found at www.macquarie.com/mic on the Reports and Presentations page behind the Investor Center tab.

ABOUT MACQUARIE INFRASTRUCTURE COMPANY

Macquarie Infrastructure Company owns, operates and invests in a diversified group of infrastructure businesses, which provide basic, everyday services, to customers in the United States. Its businesses consist of an airport services business, a 50% indirect interest in a bulk liquid storage terminal business, a gas production and distribution business, a district energy business, and an airport parking business. The Company is managed by a wholly-owned subsidiary of the Macquarie Group. For additional information, please visit the Macquarie Infrastructure Company website at WWW.MACQUARIE.COM/MIC.

FORWARD LOOKING STATEMENTS

This filing contains forward-looking statements. We may, in some cases, use words such as "project", "believe", "anticipate", "plan", "expect", "estimate", "intend", "should", "would", "could", "potentially", or "may" or other words that convey uncertainty of future events or outcomes to identify these forward-looking statements. Forward-looking statements in this report are subject to a number of risks and uncertainties, some of which are beyond our control including, among other things: our ability to successfully integrate and manage acquired businesses, retain or replace qualified employees, manage growth, make and finance future acquisitions, service, comply with the terms of and refinance debt, and implement our strategy, our shared decision-making with co-investors over investments including the distribution of dividends, our regulatory environment establishing rate structures and monitoring quality of service, changes in general economic or

business conditions, demographic trends, the political environment, the economy, tourism, construction and transportation costs, air travel, automobile usage, fuel and gas costs, our ability to recover increases in costs from customers, reliance on sole or limited source suppliers, foreign exchange fluctuations, risks or conflicts of interests involving our relationship with the Macquarie Group, environmental risks and changes in U.S. federal tax law.

Our actual results, performance, prospects or opportunities could differ materially from those expressed in or implied by the forward-looking statements. Additional risks of which we are not currently aware could also cause our actual results to differ. In light of these risks, uncertainties and assumptions, you should not place undue reliance on any forward-looking statements. The forward-looking events discussed in this release may not occur. These forward-looking statements are made as of the date of this release. We undertake no obligation to publicly update or revise any forward-looking statements, whether as a result of new information, future events or otherwise, except as required by law.

"Macquarie Group" refers to the Macquarie Group of companies, which comprises Macquarie Group Limited and its worldwide subsidiaries and affiliates. Macquarie Infrastructure Company LLC is not an authorized deposit-taking institution for the purposes of the Banking Act 1959 (Commonwealth of Australia) and its obligations do not represent deposits or other liabilities of Macquarie Bank Limited ABN 46 008 583 542 (MBL). MBL does not guarantee or otherwise provide assurance in respect of the obligations of Macquarie Infrastructure Company LLC. MIC-G