Cross,
All kinds of rumors out there. With due respect to your sources, the math doesn't add up.
1. Indigo isn't paying for airframes; those on property in the next few years will be 'bargain' leases, which are complete tax write offs as operating expense. I'm sure NEOs will be leases as well.
2. Indigo's M.O. with Spirit was aggressive, steady growth as a tool to increase valuation
3. Current and forecast hiring is in line with the projections I heard last winter for a few more airframes this year (including the white tail in paint down at Goodyear right now), @10 next year prior to NEO deliveries.
4. How can we support all of the announced new flying with current airframes? I realize higher utilization is part of the model, but that will largely be accomplished via the increase in cdo's and redeyes.

Anyway, all conjecture at this point.