You can get gift certificates at any of the major airlines. As well you could also get him a gift certificate at a travel agency in your area if you are leaving the vacation up to him.
aerlingusvouchers.com sells gift vouchers for Aer Lingus. However, you can only buy a single gift voucher each transaction, so multiple transactions may be needed if you want a lot of them.
Travelocity and priceline give great deals on airline tickets to pretty much anywhere you want to travel. You can find a wide range of prices and destinations on these sites.
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Many of the major airlines do offer gift certificates; Alaska Airlines, United Airlines, Jet Blue, United Airlines, Virgin Blue, and American Airlines are some of the airlines that do sell gift certificates. When purchasing a gift certificate from an airline it is important to check the terms and conditions.
Before purchasing any airline tickets it is always best to do research and compare prices. Websites such as www.travelocity.com and www.cheapoair.com have great deals on airline tickets. Orbitz.com also has several cheap airline tickets for sale.
I have heard the sooner you buy the tickets in advance the cheaper your can get the tickets. But I do know of a cheap website to buy airline tickets online at: www.orbitz.com.
The chepaest airline tickets can be found through your own personal favorite airline provider, though be warned, airline ticket prices have skyrocketed.
There are a lot of places where cheap group airline tickets are available online. airgorilla.com and travelocity.com are just a couple of good locations to get cheap airline tickets.
from spirit airline
A voucher is a sort of gift certificate that can be used somewhere. It could be a gift or the result of returning something without the receipt.
An inkjet of laser would be suitable to print airline tickets.