Lyft and Delta have a limited time promotion that will earn you extra SkyMiles on your rides.
Members with linked accounts can earn 10X miles on airport rides and 3X miles on all other rides in the US until 12/25/18. Enter SKYMILES10X in the “Promos” section of your Lyft app to qualify. Offer valid 12/14/18-12/25/18.
Usually you only earn 1X Delta mile per $1 spent, so you earn three times the rate now with this promotion. Ten times more for airport rides. Not a bad deal for some extra SkyMiles. You can also earn TrueBlue points on Lyft airport rides.