With the demand environment weak, Fitch warned that "internal cash generation alone will not be sufficient to prevent an erosion of [UA's] unrestricted liquidity position by year end. . .United does face steady and heavy debt maturities." As of April 21, UA had scheduled maturities of debt and capital leases totaling $655 million for 2009's final three quarters. "Even if revenue trends stabilize late in the year, the airline faces over $1 billion in scheduled debt and capital lease principal payments for 2010 raising the probability of a deepening liquidity crisis," Fitch said, adding that UA also has scheduled debt maturities of $869 million in 2011.