Generally speaking, it's "bad form" to text someone you have had ZERO contact with for four-plus years.
At least make the initial contact, talk about your goals or at least forge contact and say, "I've been heavily considering applying for (airline) and I want to know your thoughts" or something relatively similar.
At least make the initial contact, talk about your goals or at least forge contact and say, "I've been heavily considering applying for (airline) and I want to know your thoughts" or something relatively similar.