Yep, Frontier is doing it too. Their-site-only fare deals. Purchase this latest sale by November 28 and complete travel by Mar 5 next year.
- 10 day advance purchased required (Mexico excluded)
- Choose off-peak travel days
- Tuesday and Wednesday for US
- Monday - Thursday for Mexico travel
- Fares shown are each way, roundtrip purchase required
- Fares advertised do not include government taxes and fees