Never in hell. The airlines in particular have abrogated trust over and over again -- reneging on commitments, changing terms, making the Contract of Carriage increasingly one-sided, and exploiting customers opportunistically. A bond requires trust. I would not trust an airline to sort my socks, let alone honor bond issuance terms.
In this crisis the airlines suffer from a real disadvantage some other industries don't: they have virtually no store of public goodwill built up. I would buy a bond from my local steakhouse, my local barber shop, my cleaning service, etc. I trust them. I don't trust the airlines.