As 'Puritan' said in his post (now a
Sticky) at the top of this forum:
2). Making applications.
Applying for employment as a pilot does not entitle one to a reply, and certainly not if you application was unsolicited, i.e. the airline has not advertised for applications, you just thought you’d send one in anyway on the off chance.
Replying to the hundreds, and/or thousands, of applications takes time and requires that somebody is assigned to the task and, ergo, that costs money; and airlines hate (neigh, loathe) spending money, unless they absolutely have to.
Do not feel diss’d just because you don’t get a reply to your CV from an airline that is not recruiting.
It's somewhat harsh, but also likewise true advice.