Wichita ? Aircraft parts maker Spirit Aerosystems has reached tentative agreement with the Machinists union on a new, 10-year contract at the Wichita plant.

The deal was announced Wednesday. Union members will vote on the offer Friday — the day their current contract expires.

The Machinists represent nearly 6,000 workers at Spirit, which was formed in 2005 after Boeing spun off its commercial aircraft operations in Wichita and Oklahoma.

KAKE-TV reports the proposal includes cost-of-living adjustments, a 1 percent wage increase in four of the 10 years, an early retirement option and increases in pensions.

Spirit officials say the 10-year offer represents their promise to stay in Wichita.