July traffic numbers per the article:
ULCC Allegiant Air: 80%
"Along with ULCC Allegiant Air—which will also operate upwards of four-fifths of last year’s capacity in July—Spirit is leading the pack of U.S. carriers in terms of restoring domestic flying next month. That compares to 65-75% for Southwest Airlines, 50-70% for Frontier Airlines, 50-60% for JetBlue Airways, 55% for American Airlines, 38% for Delta Air Lines and 30% for United Airlines.
The service resumptions come as demand for domestic leisure travel continues to rebound. Passenger throughput data tracked by TSA reached 576,000 travelers on June 18, the highest amount since mid-March, but still down 78% from the same day last year."
Note: Traffic has reached 607,540 on June 22, 2020.