Last week, NOAA released preliminary figures for its annual greenhouse gas index, which incorporates data from 60 sites around the world - including Zeppelin.

"This past fiscal year was the second most successful year in our company's history, " said company President Nicola Leibinger-Kammüller in presenting the preliminary figures.

The key figures for the second quarter haven't been tallied yet, but preliminary calculations from Lehman Brothers suggest volume will be down year-over-year for the month and the quarter.