Related Clues:

• Cruising level, for ex.
• Jet level: abbr.
• PC key near Shift
• Flight height: Abbr.
• Voice under sop.
• Flight stat
• Optional hwy. route
• Bottom-row key
• Not the main rte.
• ___-country (Drive-By Truckers' genre)
• Space neighbor?
• Ctrl+___+Del
• Optional rte.
• ___-country
• ''Ctrl'' neighbor