Ann Romney's airplane made an emergency landing, press secretary Andrea Saul reports:

.@AnnDRomney plane makes emergency landing in CO. All okay. Thank goodness.

— Andrea Saul (@andreamsaul)
September 21, 2012

Re: @AnnDRomney emergency landing: apparently the plane filled with smoke ...

— Andrea Saul (@andreamsaul)
September 21, 2012

UPDATE: Saul adds:

PIC: fireman rush plane after @AnnDRomney emergency landing pic.twitter.com/sILA4z6M

— Andrea Saul (@andreamsaul)
September 21, 2012