Advent Investor Presentation Deck

DISCLAIMER (continued) V This presentation contains "forward-looking statements" within the meaning of applicable securities laws, including statements with respect to Advent's strategies, future opportunities and growth prospects, Advent's financial statements, as well as other information and statements that are not historical fact. These forward-looking statements regarding future events and the future results of Advent are based on current expectations, estimates, forecasts, and projections about the industry in which Advent operates, as well as the beliefs and assumptions of Advent's management. These forward-looking statements are only predictions and are subject to known and unknown risks, uncertainties, assumptions and other factors beyond Advent's control that are difficult to predict because they relate to events and depend on circumstances that will occur in the future. They are neither statements of historical fact nor promises or guarantees of future performance. Therefore, Advent's actual results may differ materially and adversely from those expressed or implied in any forward-looking statements and Advent therefore cautions against relying on any of these forward-looking statements. Factors that might cause or contribute to such differences include, but are not limited to: economic conditions globally; the impact of competition; political and economic developments in the countries in which Advent operates; regulatory developments in Greece, Europe and internationally; the COVID-19 pandemic; the inability to recognize the anticipated benefits of the proposed business combination between ACMI Acquisition Corp. ("AMCI") and Advent, which may be affected by, among other things, the ability to maintain NASDAQ's listing standards following the consummation of the business combination; Advent's ability to manage growth; Advent's ability to execute its business plans and the timing and costs of these plans; Advent's estimates of the size of the markets it serves; the rate and degree of market acceptance of Advent's products; rising costs or pricing pressures adversely affecting Advent's profitability, including sales and marketing expenses; expectations regarding capacity constraints; potential litigation involving Advent; the validity enforceability of Advent's intellectual property and Advent's compliance with the intellectual property rights of third parties; and other risks and uncertainties indicated from time to time in Advent's filings with the U.S. Securities and Exchange Commission ("SEC"), including those set forth under "Risk Factors" therein, and other documents to be filed with the SEC. Any forward-looking statements made by or on behalf of Advent speak only as of the date they are made. Advent undertakes no obligation to update any forward- looking statements to reflect any changes in their respective expectations with regard thereto or any changes in events, conditions or circumstances on which any such statement is based. Accordingly, attendees and recipients should not place undue reliance on forward-looking statements due to their inherent uncertainty. In this presentation, Advent relies on and refers to information and statistics regarding industry data. Advent obtained this information and statistics from third-party sources, including reports by financial data firms and other firms. Advent has supplemented this information where necessary with information from discussions with its own internal estimates, taking into account publicly available information about other industry participants and Advent's management's best view as to information that is not publicly available. Such information has not been subject to any independent audit or review. To the extent available, the industry, market and competitive position data contained herein has come from official or third party sources. Third party industry publications, studies and surveys generally state that the data contained therein has been obtained from sources believed to be reliable, but that there is no guarantee of the accuracy or completeness of such data. While Advent reasonably believes that each of these publications, studies and surveys has been prepared by a reputable party, neither Advent nor any of their respective directors, officers, employees, agents, affiliates, advisors or agents, have independently verified the data contained therein. In addition, certain industry, market and competitive position data contained herein come from Advent's internal research and estimates based on the knowledge and experience of Advent's management in the markets in which Advent operates. While Advent reasonably believes that such research and estimates are reasonable, they, and their underlying methodology and assumptions, have not been verified by any independent source for accuracy or completeness and are subject to change. Accordingly, reliance should not be placed on any of the industry, market or competitive position data contained in such information and no representation or warranty (express or implied) is given that such data is correct or complete. ADVENT Any Fuel. Anywhere. 3

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