Via Twitter: (pretty self explanatory)
Link to get voucher: https://promotion.lufthansa.com/us_summerend/
- The voucher can be redeemed between 25/05/2012 and 31/05/2012.
- Travel must be between 12/08/2012 and 12/09/2012.
- Vouchers are only valid for itineraries where all flights are operated by Lufthansa and Lufthansa Regional Partner (incl. Lufthansa City Line and Eurowings).
- The voucher is only valid for flights departing in United States of America.
- Vouchers are valid for travel between August 12, 2012 through September 12, 2012
- Travel must be completed before September 12, 2012
- Vouchers are valid for flights operated by United Airlines, Austrian Airline and Air Canada