The best Delta customers can hope for is a simple refund

• Delta is still canceling and delaying flights days after the botched CrowdStrike update.
• Customers can expect a refund at best, legal experts say.
• "Airline passengers have very few rights," a former Transportation Department inspector general said.

After Friday's global meltdown caused by a botched CrowdStrike software update, most airlines rescheduled the vast majority of flights and have largely resumed normal operations.

Except for Delta.