Route 721: Chain Bridge Road - McLean
- Summary: New route
- Metro Stations served: McLean (Silver), Tysons Corner (Silver)
- Route serves: Central McLean, Chain Bridge Road, Georgetown Pike
- Route operates: Weekdays, Saturdays and Sundays
- Weekdays: 6 a.m. - 10 p.m.
- Saturdays: 6 a.m. - 10 p.m.
- Sundays: 8 a.m. - 8 p.m.
Frequency of service:
- Weekdays: every 15 minutes during rush hour; every 30 minutes all other times
- Saturdays: every 30 minutes
- Sundays: every 30 minutes