Yes it is possible to blot AIV+ allantoic fluid and subsequently recover RNA depending on the length and conditions of storage.
FTA has been successfully used for storage of AIV in allantoic fluid (Journal of Virological Methods 174 (2011) 120–122) and RNA remains intact for several months. If you are not concern about virus remaining infectious, you can use plain whatman #1 filter paper (less expensive) with similar results. The disadvantage of this is that the sample remains infectious for at least 3 days.
FTA cards are working very well and are very useful if you want to ship your material for instance, cince the chemicals in the FTA card will inactivate the viruses will preserving the RNA. However, you should not overload the card with material because anything that would not be well inside the paper will not be inactivated.
You can then keep the cards at 4°C (in a small plastic bag with dessicant to maintain the cards dry) for quite a long time.
You can use standard RNA extraction to purify the RNA from the card, after cutting small circles out of the card (6 mm diameter circles seem to be enough).
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