* Check up to two bags on any United or United Express flight, domestic or international

* Covers up to eight companions flying on the same confirmation code

* "Introductory price." No word on what the regular price will be, or when it will take effect

* Does not cover oversize or overweight bags

* UA's regular fees are $20 for first bag, $30 for second bag. A traveler checking two bags would break even after five flights. A family or group could break even on the first flight.