Monroe1 could be absolutely correct in his projection.
The only real barrier is money.
If the new airplane is a B777 or B787 the MINIMUM lease rate is 400,000 per month and probably quite a bit more. If everything goes perfectly, they will need possession of the jet for 3 months before revenue flights begin (setup, conformity, demonstrations, proving flights).
Despite what has been said here, the DOT will require another audit of the books to ensure they have 3 months operating expenses (assuming no revenue) in the bank ...or guaranteed by someone... before they can sell tickets. This is to keep pax from getting screwed out of their money.
That's a lot of money required. IMO, if someone ponies up big, there's no reason they can't be flying by the holidays.