Not a Spirit pilot; United. I tip the van driver $2 and the maid $2/night. When times were tighter for me, it was $1 for the van driver and $1/night for the maid. It's standard etiquette to tip both the drivers and maids. It's not standard to tip the front desk clerks and I've only tipped desk clerks on personal travels when given awesome suite upgrades.

In the last year or so, I started buying $10 Starbucks cards that I occasionally give to gate agents and FAs when jumpseating. Not necessary, not expected, but appreciated by them. They don't make much money.

I don't know how many singles I go through a month. I stop by a casino almost every trip and get $20 in singles. I look at it as just a normal job expense.