CWAFlyer From United States of America, joined Mar 2005, 686 posts, RR: 1
Reply 2, posted (9 years 9 months 2 days 16 hours ago) and read 1858 times:
Yes. Most try to. A lot of the spares are used for charters, especially
during the NFL season. There are times that due to maintainence,
damage, airworthiness directives, etc, the spares are not available.