I concur with Suzy's advice. Sometimes pilots are away on business trips, already have a transport scheduled that conflicts with your request, etc, which is why you don't hear back. As Suzy noted, they receive lots of e-mails so I figure if I don't hear back, then for whatever reason that pilot is unavailable to assist. Also around this time of year until mid August, it can be more difficult to find pilots because lots have families and go on vacation with them; especially if they have school age children.
I typically do what Suzy mentioned--send out lots of e-mails. To make it a bit easier, I will prepare however many "texts" I need for the e-mails. For example, if the route requires having multiple legs[let's say Louisville to Indianapolis to Chicago to Michigan], I will prepare one text re: leg 1[Louisville to Indy] for the e-mail I'll send to the pilots I'll contact about flying that leg. Then I will prepare anonther text re: legs 1 and 2[could you fly Louisville to Indy or Indy to Chicago] that will be in the e-mails I send to the Indy based pilots. And so on[Chicago pilots ask if can fly Indy to Chicago or Chicago to MI]. I've found this makes it easier because you can copy and paste.
Did you put a particular day or days you want the animal to be transported? If yes, but you have some flexibility regarding when the transport occurs, I often note in my e-mail that I would like the transport to occur on X date, but if that is inconvenient for you, could you please let me know which dates are better for you. Of course, there are times when a transport has to go during the specified day or dates, but if you have some flexibillity, you'd probably hear from more pilots if you state your preferred transport date(s) and if those dates are bad, ask for their availability.
Hope this helps!
PNP Transport Advisor
Kentucky Animal Relief Fund, Inc.