CWAFlyer From United States of America, joined Mar 2005, 657 posts, RR: 1
Reply 2, posted (8 years 9 months 1 day 10 hours ago) and read 1700 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.