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.
(Photo: Elaine Thompson, AP). Alaska Airlines is raising its fee for checking a suitcase to $25, bringing it in line with most major airlines. For tickets purchased on or after Oct. 30, the Seattle-based airline will charge passengers $25 each for the first and second checked bags.Additional bags will cost $75.Alaska currently charges $20 per bag for the first three suitcases.merican Airlines, Delta, United Airlines and US Airways all increased their change fees on domestic tickets from $150 to $200 in May. Alaska Airlines Group Inc. expects the higher fees to result in $50 million of additional revenue each year.