Need to fly back home due to a family emergency, but I have NOT YET received my green card in the mail, and MRIV expiration date passed

[Sabela 16]

@Mike E, thank you very much for your advice. Thankfully, I'm traveling with American Airlines, British Airways , and Iberia (long flight here). I don't plan on being abroad more than 2-3 weeks, until my father gets better, so I won't have people mailing me my green card. Thanks again.

[Mike E 11,739]

4 minutes ago, Sabela said:

@Mike E, thank you very much for your advice. Thankfully, I'm traveling with American Airlines, British Airways , and Iberia (long flight here). I don't plan on being abroad more than 2-3 weeks, until my father gets better, so I won't have people mailing me my green card. Thanks again.

In that thread I linked, American was also going to strand the OP.  Eventually American called CBP, which gave clearance to board.  
 

Expect the worst and you will be prepared. 
 

DHS’s implementation of I-551 is just a mess and I’m not surprised airlines have I-551 fatigue. It also doesn’t help that sometimes when airlines call CBP, the B-team answers the phone.  
 

 

[Sabela 16]

@Mike E, who is the B-team? And also, if I have any troubles, it would be on my way BACK to America, correct? (I will be prepared, expect the worse, and have the CBP number handy)

[Mike E 11,739]

1 minute ago, Sabela said:

@Mike E, who is the B-team?

A-team and B-team are American slang referring to competency. 
 

The people who answer the phone and illegally order the airline to not board an LPR who has a valid I-551 are the B-team: not competent and definitely malicious.  
 

 See 

 

CBP was called three times. First time the A-team authorized boarding because that is the law and policy. The second time the B-team answered and said do not board and gaslighted OP on CBP’s published policy. Third time, the A-team answered and authorized boarding.  

 

1 minute ago, Sabela said:

And also, if I have any troubles, it would be on my way BACK to America, correct? (I will be prepared, expect the worse, and have the CBP number handy)

Over 99 percent of the time it is when you return to USA.  I had a gc for over  30 years and traveled 100s of times outside the USA. Three times I was required by the airline to show my I-551 before I left the USA. 

[Hopeful2022 76]

The airline staff is as tough and as strict as the cbp. Did they undergo the same training