Noun. 1. interleukin-any of several lymphokines that promote macrophages and killer T cells and B cells and other components of the immune system. lymphokine-a cytokine secreted by helper T cells in response to stimulation by antigens and that acts on other cells of the immune system (as by activating macrophages).
Now, passengers must pay a flat fee of $5.60 in each direction, no matter how many plane transfers are made to get from one city to another. For passengers flying a nonstop round trip, that means the fee will increase from $5 to $11.20.Passengers flying round-trip with a connection each way will see their fees increase $1.20 to $11.20 per round trip, versus $10 before the fee increase.ost of the new revenue will go to pay down the federal deficit. Until Monday, a passenger was charged $2.50 for each leg of a journey. For a nonstop round trip, the cost was $5. For a round trip with a connection each way, the cost was $10. The fee was capped at two flights each way.
Most do charge fees. Since 1998, the number of agencies charging service fees on one or more product line has increased from 64 percent to more than 91% percent in 2009.The most common fee charged is a service fee for airline ticket procurement services.On average, ASTA travel agencies charge their customers $36 for providing this service. Agencies also often charge fees for other services such as trip research, Amtrak, car rental and hotel-only reservations.ost do charge fees. Since 1998, the number of agencies charging service fees on one or more product line has increased from 64 percent to more than 91% percent in 2009.