Bureau of Transportation Statistics (BTS) data shows that during the first half of this year, United paid out $170.8 million in commissions, up 43.4% year over year. American paid out $240.2 million in commissions, up 9%. Delta's commissions jumped 4.3%, to $311 million. The BTS data isn't exclusive to agencies and can also include commissions paid to other parties, most notably airline partners. For United, the large jump in commissions has paralleled strong results in corporate sales, where revenue in the third quarter was up double-digits year over year. In terms of percentage growth, corporate-sales revenue was also up significantly more than United's overall revenue, chief commercial officer Andrew Nocella said on the carrier's Oct. 18 earnings call. Get the full story at Travel Weekly