Originally Posted by Bluedriver

Not sure what that hot mess was trying to say, but let's spell it out.

JB has 18 month upgrades on the E190, around 4 years I think on the A220/A320. When the E190s are replaced with all A220s, I would expect upgrade to level somewhere between the 18 months and 4 years, call it 3. They are upgrading at that rate because of 300 aircraft existing, deliveries, attrition and retirements.

Spirit has a 3-4 year upgrade (I believe). That upgrade is to support around ~200 aircraft, deliveries, attrition and maybe a few retirements.

Put the two together you still have to staff 500 aircraft, you will then have TWO order books to staff for, some attrition, some retirements, the upstaffing required for JCBA rules, staffing to get aircraft utilization back up to historical norms, and you will always have upgrade bypassers.

If both airlines were mature, you could see a situation where 2+2 equals 3.5 when combined. That is NOT JB+NK, and the airline wants to fully compete with the big 4 and grow.

There is no reason to believe upgrade time will double at the combined company.​​​​​