This excerpt taken from the SIRI 8-K filed Feb 17, 2006.
SIRIUS defines adjusted loss from operations as GAAP loss from operations before depreciation and equity granted to third parties and employees. SIRIUS believes adjusted loss from operations is useful because it represents operating expenses of the company excluding the effects of non-cash items.
Average monthly churn, SAC per gross subscriber addition, ARPU and adjusted loss from operations are not measures of financial performance under U.S. generally accepted accounting principles and are used by SIRIUS as measures of operating performance. As a result, these metrics may be susceptible to varying calculations; may not be comparable to other similarly titled measures of other companies; and should not be considered in isolation or as a substitute for measures of financial performance prepared in accordance with U.S. generally accepted accounting principles.